Odds languageVig, juice, implied probability and closing lines.
Market languageMoneylines, spreads, totals, props and futures.
Sportsbook languageCash out, bonus bets, rollover and verification terms.
1. WHY A GLOSSARY IS WORTH READING START TO FINISH
VIGThe sportsbook margin built into the price.
IMPLIED PROBABILITYThe chance represented by a set of odds.
CLVClosing-line value - how your bet compares with the final market price.
PROPA wager on a specific occurrence or player outcome.
Most glossaries are built to be searched, not readyou look up one term, get a one-line definition, and move on. This guide works a little differently. Sports betting terminology clusters into families that make a lot more sense together than in isolation: understanding "vig" is easier once you understand "implied probability," and "correlation" only really clicks once you already know what a "same-game parlay" is. So while every term here is easy to look up individually, reading each section straight through will genuinely teach you more than jumping around term by term.
Each entry includes not just a definition, but a short note on how and when you'll actually encounter that term on a real sportsbook app or in real betting conversationbecause a lot of glossaries define terms accurately but don't explain why the definition matters in practice.
If a term here feels unfamiliar even after reading its definition, it's likely covered in more depth in one of our other guidesthis glossary is meant to complement, not replace, our full guides on American odds, moneyline vs. spread vs. total, and parlays and same-game parlays.
2. ODDS AND PRICING TERMS
AMERICAN ODDSThe plus/minus odds format standard at US sportsbooks. A minus number shows what you'd risk to win $100; a plus number shows what you'd win on a $100 bet. Covered in full depth in our American odds guide.
DECIMAL ODDSAn odds format, common outside the US, showing your total return per $1 wagered, stake included. Decimal odds of 2.40 mean a $1 bet returns $2.40 total if it wins.
FRACTIONAL ODDSAn odds format common in the UK, showing profit as a fraction relative to stake. Odds of 7/5 mean $7 profit for every $5 wagered.
IMPLIED PROBABILITYThe percentage likelihood a given odds number represents, calculated directly from the odds themselves. You'll encounter this term most often when comparing whether a specific price seems fair relative to your own estimate of how likely something is.
JUICEAnother common word for the vig; used interchangeably in most casual betting conversation and occasionally in sportsbook marketing copy.
LINEA general, catch-all term for any posted number on a bet - "the line" can refer to the spread, the total, or the moneyline depending on context. "What's the line on the Chiefs game" could mean any of the three.
ODDS BOOSTA promotional adjustment that improves a specific bet's payout above its standard market price, usually applied automatically to a featured game or player without needing a promo code.
OPENING LINEThe first odds a sportsbook posts for a given event, before any betting volume has caused adjustment.
CLOSING LINEThe final odds available right before an event starts. Generally considered the sharpest, most information-rich number of the entire betting window, since it reflects the most betting volume and the most last-minute news.
VIG (VIGORISH)The sportsbook's built-in profit margin, reflected in pricing both sides of a bet slightly worse than a truly fair 50/50 market would suggest. Standard -110 pricing on both sides of a spread carries a combined vig of roughly 4.8%.
3. CORE BET TYPES
MONEYLINEA bet on which side wins outright, with no point margin involved. Covered in depth in our moneyline vs. spread vs. total guide.
SPREAD (POINT SPREAD)A projected margin of victory. A favorite must win by more than the spread number to cover; an underdog covers by either winning outright or losing by less than the spread.
TOTAL (OVER/UNDER)A projected combined score for both teams. You bet whether the actual combined score lands over or under that number, independent of who wins.
RUN LINEBaseball's fixed-margin alternative to a moving spread, almost always set at exactly 1.5 runs regardless of the specific matchup, with the odds attached to it doing the work a moving spread number does in other sports.
PUCK LINEHockey's equivalent to the run line, typically set at 1.5 goals, reflecting hockey's relatively low-scoring nature.
ALTERNATE LINEA spread or total offered at a different margin than the standard posted number, priced with odds adjusted to reflect the easier or harder condition.
PROP BET (PROPOSITION BET)A bet on a specific occurrence within a game that isn't directly tied to the final score or margin - a player's statistical output, whether a specific event happens, and so on.
FUTURESA longer-term bet that settles weeks or months after you place it, such as a team's odds to win a championship before the season even starts.
TEASERA multi-leg bet that adjusts the spread or total in your favor on every leg, in exchange for reduced overall payout odds compared to a standard parlay of the same legs.
4. PARLAY AND MULTI-BET TERMS
PARLAYA single bet combining two or more individual legs, called "legs," where every leg must win for the parlay to pay out. Covered in full depth in our parlays and same-game parlays guide.
LEGA single individual bet within a larger parlay.
SAME-GAME PARLAY (SGP)A parlay combining multiple bets from a single game, rather than combining bets across different games.
CORRELATIONThe degree to which two outcomes tend to happen together (positive correlation) or work against each other (negative correlation). This is the specific reason same-game parlays are priced differently than simply multiplying each leg's individual odds together.
ROUND ROBINA bet that automatically generates every possible smaller parlay combination from a larger group of individual picks, offering a middle ground between straight betting and a single large parlay.
PARLAY INSURANCEA promotional offer that refunds a losing parlay, usually as bonus bets, if exactly one leg loses while every other leg wins.
PROFIT BOOSTA promotional token that increases a bet's payout odds by a set percentage, frequently used on parlays specifically because it helps offset some of the compounding vig described in section 2.
BUYING POINTSPaying worse odds in exchange for a more favorable spread or total number on a single bet, distinct from a teaser since it applies to one bet rather than multiple combined legs.
5. PLAYER AND GAME PROP TERMS
PLAYER PROPA bet on an individual player's statistical output in a game - passing yards, points scored, strikeouts, and similar individual performance markets.
GAME PROPA prop bet tied to the overall game rather than a specific player - which team scores first, whether the game goes to overtime, and similar outcomes.
ANYTIME TOUCHDOWN SCORERA moneyline-style football prop betting on whether a specific player scores a touchdown at any point during the game, regardless of how.
ALTERNATE PROP LINEA player prop offered at a different statistical threshold than the standard posted line, with odds adjusted to reflect the easier or harder condition, similar in concept to an alternate spread or total.
COMBO PROPA prop combining multiple statistical categories for one player into a single number, such as points plus rebounds plus assists in basketball.
FIRST FIVE INNINGS (F5)A baseball-specific market that settles based on the score after five complete innings, regardless of what happens afterward, letting bettors isolate the starting pitching matchup from bullpen variance.
PLATOON SPLITA baseball term describing how a pitcher or hitter performs differently against left-handed versus right-handed opponents, a common factor sharp bettors check before betting pitcher props.
6. LIVE AND IN-PLAY BETTING TERMS
LIVE BETTING (IN-PLAY BETTING)Betting placed on a game that has already started, with odds updating continuously as the game unfolds.
CASH OUTA feature letting you settle a bet before the game finishes, locking in a smaller guaranteed profit or a reduced loss compared to letting the original bet ride to its natural conclusion.
LIVE LINE (IN-GAME LINE)The continuously updating spread, moneyline or total odds available once a game is already in progress.
MOMENTUM SWINGA casual, non-technical term bettors use for a stretch of a game where win probability shifts quickly, common in basketball scoring runs and used loosely rather than as an official market term.
STALE ODDSLive odds that haven't been updated fast enough to reflect a recent play, sometimes exploitable for a brief window if a sportsbook's live pricing engine is slow to refresh, though most licensed books actively guard against this.
7. MONEY, ACCOUNTING AND PAYOUT TERMS
STAKEThe amount of money you wager on a specific bet.
PROFITThe amount you win on top of your original stake if a bet wins; distinct from "total return," which includes the stake being given back as well.
TOTAL RETURNThe full amount paid out on a winning bet, equal to your original stake plus your profit combined.
UNITA standardized measure of bet size relative to a bettor's total bankroll, commonly set at 1-2% of bankroll per unit, used to keep bet sizing consistent regardless of a specific bet's dollar amount.
BANKROLLThe total amount of money a bettor has set aside specifically for betting, separate from other personal finances.
ACTIONA casual term meaning an active, placed bet - "I've got action on this game" simply means you have money riding on the outcome.
HANDLEThe total amount of money wagered on a specific game, market, or across an entire sportsbook, commonly referenced in sports betting news coverage (for example, "the Super Bowl generates the highest handle of any single event").
HOLD (HOLD PERCENTAGE)The percentage of total handle a sportsbook keeps as profit after paying out winning bets, a business metric distinct from the vig on any single bet.
8. LINE MOVEMENT AND MARKET TERMS
LINE MOVEMENTAny change in the posted odds, spread, or total between when a line opens and when the event starts.
SHARP MONEYBets placed by bettors with a strong, tracked history of beating the closing line, closely monitored by sportsbooks since it can meaningfully influence how a line moves.
PUBLIC MONEYBetting volume from casual, recreational bettors, often concentrated on popular favorites and star players, tracked separately from sharp money by sportsbooks and betting media.
REVERSE LINE MOVEMENTA situation where the line moves in the opposite direction from where the majority of public bets are landing, often interpreted as a signal that a smaller amount of sharp money is having an outsized effect on the number.
KEY NUMBERA final-score margin (like 3 or 7 points in football) that occurs unusually often, making spreads set near that number especially sensitive to small adjustments like moving from -3 to -3.5.
STEAM MOVEA rapid, significant line movement across multiple sportsbooks simultaneously, typically associated with a large amount of sharp money hitting the market at once.
BEATING THE CLOSING LINE (CLOSING LINE VALUE)Consistently getting a better number than where a line ends up closing, widely considered one of the strongest indicators of genuine long-term betting skill among serious, disciplined bettors.
9. SPORT-SPECIFIC TERMS
Nfl / Football
BYE WEEKA scheduled week off during the regular season for a specific team, relevant to betting since rested teams have historically performed slightly better against the spread coming out of one.
GAME SCRIPTHow a game's flow unfolds relative to the score - a team trailing by two scores in the fourth quarter has a very different game script (more passing, more urgency) than one protecting a big lead.
Nba / Basketball
PACEThe number of possessions a team averages per game, the single biggest driver behind NBA totals.
LOAD MANAGEMENTThe practice of resting healthy star players on select regular-season games to manage fatigue across an 82-game season, a factor that can move betting lines significantly once confirmed.
BACK-TO-BACKGames played on consecutive nights, a well-documented situational factor affecting performance, especially for a team on the road on the second night.
Mlb / Baseball
STARTING PITCHERThe pitcher who begins the game for a team, whose specific matchup and recent form is widely considered the single most influential individual factor in baseball betting.
BULLPEN DAYWhen a team skips a traditional starting pitcher entirely and strings together multiple relief pitchers instead, requiring its own separate handicapping approach.
Nhl / Hockey
EMPTY NETTERA goal scored against a team that has pulled its own goalie late in a close game, relevant to certain hockey prop and total markets specifically because it affects final score margins.
10. BONUS AND PROMOTION TERMS
WELCOME OFFER (SIGN-UP BONUS)A promotional offer available to new customers upon registering and placing a qualifying first bet, commonly structured as bonus bets issued regardless of whether that first bet wins or loses.
BONUS BET (FREE BET)Promotional betting credit that must be wagered before any winnings from it become withdrawable cash, distinct from real cash in your account balance.
QUALIFYING WAGERThe specific first bet, usually with a minimum stake requirement, that triggers a welcome offer once it settles.
PLAYTHROUGH REQUIREMENT (WAGERING REQUIREMENT)The condition that bonus funds must be wagered a certain number of times, or on bets meeting certain odds thresholds, before becoming eligible for withdrawal.
ODDS BOOSTCovered in section 2; a promotional price improvement on a specific bet, applied automatically without a promo code in most cases.
RISK-FREE BETAn older, less common promotional structure that refunds a losing first bet as bonus bets, distinct from "bet and get" offers that pay out bonus bets regardless of whether the qualifying bet wins.
REFER-A-FRIENDA promotion paying a bonus bet to both an existing customer and a new signup once the new account places a qualifying wager.
11. ACCOUNT, VERIFICATION AND RESPONSIBLE GAMBLING TERMS
KYC (KNOW YOUR CUSTOMER)The identity verification process every licensed US sportsbook is legally required to complete before allowing real-money withdrawals, typically involving confirming your name, date of birth, and sometimes uploading a photo ID.
GEOLOCATIONThe technology sportsbook apps use to confirm you're physically located within a state where online betting is legally licensed, required by law for every regulated US sportsbook.
SELF-EXCLUSIONA responsible gambling tool letting a customer voluntarily block their own access to a sportsbook, typically for a set period or permanently, as part of licensed operators' required responsible gambling programs.
DEPOSIT LIMITA responsible gambling tool letting a customer cap how much money they can deposit into their account over a given period.
COOL-OFF PERIODA temporary, self-imposed pause on account access, typically ranging from 24 hours to 30 days, distinct from full self-exclusion.
RESPONSIBLE GAMBLING TOOLSThe collective term for deposit limits, wager limits, cool-off periods and self-exclusion options every licensed US sportsbook is required to offer.
12. SLANG AND CASUAL TERMS YOU'LL ACTUALLY HEAR
These terms won't appear on a sportsbook's official interface, but you'll encounter them constantly in betting conversation, social media, and sports media coverage.
CHALKSlang for the favorite in a given matchup; "betting the chalk" means betting favorites.
DOGShort for "underdog."
LOCKSlang for a bet someone considers a near-certainty, used casually and often ironically, since no bet is ever truly guaranteed.
HANDLECovered formally in section 7, but also used casually to mean the total amount of money bet on something.
BAD BEATA bet that seemed likely to win for most of the game but ultimately lost, often due to a late, unlikely turn of events.
COVERShorthand for winning a spread bet - "did they cover" means "did they beat the spread."
HOOKSlang for the half-point in a spread or total (as in -3.5, "the hook" refers to that extra half point).
JUICE / VIGCovered formally in section 2, but used interchangeably in casual conversation.
SHARPA bettor with a strong, respected track record, as opposed to a "square," a term for a more casual, less consistently profitable bettor.
WISE GUYAn older slang term, closely related to "sharp," for an experienced, well-informed bettor.
13. TERMS THAT SOUND SIMILAR BUT MEAN DIFFERENT THINGS
A handful of term pairs cause genuine confusion for newer bettors specifically because they sound alike or get used loosely in casual conversation. Worth separating clearly:
"ODDS" VS. "LINE"Odds specifically refers to the American, decimal, or fractional pricing number. "Line" is a broader catch-all that can refer to the spread, the total, or the moneyline depending on context.
"PROFIT" VS. "TOTAL RETURN"Profit is only the amount won on top of your stake. Total return includes your original stake being paid back as well. Confusing these two leads to overestimating how much a winning bet actually nets you above what you already had.
"VIG" VS. "HOLD"Vig refers to the built-in edge on a single bet's pricing. Hold refers to a sportsbook's overall profit percentage across all handle for a given market or period - a business metric, not a per-bet pricing term.
"RUN LINE" VS. "MONEYLINE"The run line is baseball's fixed-margin bet (similar in concept to a spread). The moneyline is a separate bet on which team wins outright, with no margin involved at all.
"CASH OUT" VS. "HEDGE"Cash out is a specific sportsbook feature letting you settle a bet early through the app itself. Hedging is a broader betting strategy - placing a new, separate bet on the opposite outcome to reduce risk - that can be done with or without a formal cash-out feature.
"TEASER" VS. "PARLAY"Every teaser is technically a type of multi-leg bet, but a standard parlay uses the actual posted spread and total numbers, while a teaser specifically shifts those numbers in the bettor's favor across every leg, in exchange for reduced payout odds.
14. HOW THESE TERMS SHOW UP TOGETHER ON A REAL BET SLIP
Seeing these terms in context helps cement how they relate. A typical bet slip for a same-game parlay might read something like this:
SAME-GAME PARLAY - Chiefs vs. Bills
LEG 1: Chiefs -3.5 (SPREAD) at -110
LEG 2: Over 47.5 (TOTAL) at -110
LEG 3: Mahomes Anytime TD Scorer (PROP) at +160
COMBINED ODDS: +540
STAKE: $10
POTENTIAL PROFIT: $54.00
POTENTIAL TOTAL RETURN: $64.00
LEG 1: Chiefs -3.5 (SPREAD) at -110
LEG 2: Over 47.5 (TOTAL) at -110
LEG 3: Mahomes Anytime TD Scorer (PROP) at +160
COMBINED ODDS: +540
STAKE: $10
POTENTIAL PROFIT: $54.00
POTENTIAL TOTAL RETURN: $64.00
Reading that slip with this glossary in hand: you're combining three legs into one parlay, two of which use standard spread and total markets at typical -110 vig, and one of which is a player prop. The combined odds reflect the compounding math covered in our parlays guide, and the potential profit versus total return distinction (section 7 and section 13) tells you exactly what you'd actually receive if every leg hitsyour $54 in new winnings plus your original $10 stake back.
A separate straight bet slip is much simpler:
MONEYLINE - Bills +140
STAKE: $25
POTENTIAL PROFIT: $35.00
POTENTIAL TOTAL RETURN: $60.00
STAKE: $25
POTENTIAL PROFIT: $35.00
POTENTIAL TOTAL RETURN: $60.00
Here you're betting the underdog moneyline directly, with no spread, total, or additional legs involvedthe odds themselves carry the full weight of reflecting how big an underdog the Bills are considered.
15. FREQUENTLY ASKED QUESTIONS
Q: Do all sportsbooks use the exact same terminology?
A: The core terms in this glossary are standard across virtually every licensed US sportsbook, though some promotional terms (like specific parlay insurance program names) vary by operator and are branded uniquely.
A: The core terms in this glossary are standard across virtually every licensed US sportsbook, though some promotional terms (like specific parlay insurance program names) vary by operator and are branded uniquely.
Q: Is "juice" the same thing as "vig"?
A: Yes - they're used interchangeably in almost all casual and professional betting conversation, with no meaningful difference in what they refer to.
A: Yes - they're used interchangeably in almost all casual and professional betting conversation, with no meaningful difference in what they refer to.
Q: What's the difference between a "sharp" and a "square"?
A: These are informal, casual terms rather than official sportsbook terminology. "Sharp" refers to an experienced, consistently successful bettor; "square" refers to a more casual, recreational bettor, often associated with betting popular favorites and following public sentiment.
A: These are informal, casual terms rather than official sportsbook terminology. "Sharp" refers to an experienced, consistently successful bettor; "square" refers to a more casual, recreational bettor, often associated with betting popular favorites and following public sentiment.
Q: Why do some terms have multiple names, like "bonus bet" and "free bet"?
A: Different sportsbooks and different regions sometimes use their own preferred branding for the same underlying concept. The terms function identically even when the marketing language differs slightly between operators.
A: Different sportsbooks and different regions sometimes use their own preferred branding for the same underlying concept. The terms function identically even when the marketing language differs slightly between operators.
Q: Is it worth memorizing every term in this glossary before placing a first bet?
A: No - the core terms in sections 2, 3 and 7 (odds, core bet types, and payout terms) are enough to place informed straight bets. The rest of this glossary is most useful as a reference to return to as you encounter new bet types and situations.
A: No - the core terms in sections 2, 3 and 7 (odds, core bet types, and payout terms) are enough to place informed straight bets. The rest of this glossary is most useful as a reference to return to as you encounter new bet types and situations.
Q: What's the fastest way to learn these terms in practice rather than just reading definitions?
A: Placing small, low-stakes bets while actively cross-referencing the terms on your bet slip against a resource like this one tends to cement the terminology far faster than reading definitions in isolation.
A: Placing small, low-stakes bets while actively cross-referencing the terms on your bet slip against a resource like this one tends to cement the terminology far faster than reading definitions in isolation.
Keep the process simple
Examples in this guide are educational. Confirm live prices and terms on the sportsbook and only bet within limits you can afford.