Sports Betting Glossary
Simple, plain-English definitions of betting words — odds, bet types, value and bonus terms.
Odds & Fundamentals
Action
Any wager you place on a sporting event, and also a way of saying a bet is live and counts.
Against the Spread (ATS)
A team's record judged against the point spread instead of by who simply won the game.
Bad Beat
A bet that looked like a sure winner but loses thanks to a last-second or wildly unlikely event.
Cover
When a team beats the point spread -- winning by enough, or losing by little enough -- it's said to have covered.
Even Money
A bet where your profit matches your stake: decimal 2.00, fractional 1/1, American +100.
Favorite vs Underdog
The favorite is expected to win (lower odds/shorter price); the underdog is expected to lose (higher odds/longer price).
Hook
The half-point in a spread (like -3.5 instead of -3) that takes the tie off the table so every bet wins or loses.
Implied Probability
The chance of an outcome that the odds are pointing to, with the bookmaker's margin baked in.
Juice / Vigorish (Vig)
The bookmaker's commission on every bet, tucked right into the odds.
Moneyline
A bet on who wins outright — no point spread, just pick the winner.
No Action
A bet that gets cancelled with the stake returned, usually because of a postponed event, scratched player, or voided conditions.
Odds Formats
The three main ways odds show up — Decimal, Fractional, and American (Moneyline).
Off the Board
A game or market the sportsbook has pulled from betting for now, usually because of uncertainty like injuries or weather.
Over/Under (Totals)
A bet on whether both teams' combined score will land over or under a set number.
Pick'em
A matchup with no favorite — the spread is zero, so you just pick who wins.
Point Spread
A handicap that evens things out between the favorite and the underdog.
Push
A bet that ties against the spread or total, so your stake comes straight back to you.
Straight Bet
A single wager on one outcome -- a moneyline, point spread, or total -- rather than a parlay or combo bet.
Bet Types
Asian Handicap
A soccer-friendly form of spread betting that removes the draw by giving teams fractional or whole-number handicaps.
Cash Out
A handy option that lets you settle a bet early, locking in a profit or trimming a loss before the event wraps up.
Double Chance
A bet that covers two of three soccer outcomes (home/draw, away/draw, or home/away), lowering risk for smaller odds.
Futures Bet
A bet on something decided down the road, like a season champion or tournament winner, rather than a single upcoming game.
Hedging
Betting the opposite side of a wager you already have so you lock in a profit or cut your loss no matter how it ends.
Live Betting (In-Play)
Betting on an event while it's actually happening, with the odds updating in real time as the game plays out.
Parlay (Accumulator)
One ticket that ties together two or more picks, and every single one has to win for you to get paid.
Player Prop vs Game Prop
Player props bet on one athlete's stats (like passing yards); game props bet on team or match events (like which team scores first).
Prop Bet (Proposition Bet)
A wager on something specific that happens during a game, which may have nothing to do with the final score.
Round Robin
A combo bet that builds multiple parlays from one group of picks, covering different subset combinations.
Run Line / Puck Line
A sport-specific spread -- a fixed 1.5-run spread in baseball (MLB) and a fixed 1.5-goal spread in hockey (NHL).
Same-Game Parlay
A parlay where every pick comes from one single game or event.
Teaser
A parlay that lets you shift the point spread or total in your favor, in exchange for a smaller payout.
Value & Strategy
Arbitrage Betting
Backing every outcome across different bookmakers so you lock in a profit no matter who wins.
Bankroll
The pot of money you keep just for betting, kept apart from the cash you need for everyday life.
Buying Points
Paying for a better spread or total by taking worse odds, often to get past key numbers like 3 and 7 in football.
Closing Line Value (CLV)
The gap between the odds you grabbed and the final closing odds, a go-to way to measure betting skill.
Edge
Your advantage over the book: when an outcome's true chance is higher than the odds suggest.
Expected Value (EV)
The average you can expect to win or lose per bet over the long run.
Fade the Public (Contrarian Betting)
Betting against the side most casual bettors back, on the idea that public hype creates value on the other side.
Kelly Criterion
A simple formula that tells you the best bet size to use based on your edge and how big your bankroll is.
Key Numbers
The margins of victory that come up most often in a sport, which makes some point spreads matter way more than others.
Line Shopping
Comparing odds across several bookmakers so you can grab the best available price for your bet.
Matched Betting
A method that pairs sportsbook promos like bonus bets and odds boosts with offsetting wagers to lock in profit at very low risk.
Middling
Betting both sides of a game at different spreads so that if the final margin lands in the gap, both bets win.
ROI (Return on Investment)
The percentage of profit or loss you've made compared to the total amount you've wagered.
Steam Move
A sudden, sharp line move caused by heavy betting from pros or syndicates.
Tout
A person or service that sells betting picks, often backed by inflated claims about their win rate.
Units
A standardized way to size bets relative to your bankroll, so you can track and compare results no matter the dollar amounts.
Variance (in Betting)
The natural ups and downs in results that happen even when every bet you make has positive expected value.
Market Terms
Betting Handle
The total amount of money wagered on an event or over a set stretch of time.
Betting Limits
The smallest and largest amounts a bookmaker will take on a single bet.
Chalk
Betting slang for the favorite in a game; 'betting the chalk' just means backing the side expected to win.
Line Movement
When the odds or point spread shift after the opening line drops, driven by betting action, injuries, weather, or fresh news.
Oddsmaker / Bookmaker
The person or company that sets betting lines, manages risk, and takes wagers on sporting events.
Opening Line / Closing Line
The opening line is the first odds posted; the closing line is the last odds before the event kicks off.
Public Betting Percentage
The share of total bets placed on each side of a market, showing where most casual bettors have put their money.
Reverse Line Movement
When the line moves opposite to where most public bets are landing, hinting that sharp money is backing the other side.
Sharp vs Square
Sharps are pros who bet with an edge; squares are casual bettors who tend to follow the crowd.
Stale Line
Odds that haven't been updated for fresh news like injuries or lineup changes, creating value for quick bettors.
Bonus Terms
Bonus Bet (Free Bet)
A promo bet where the book covers the stake; win it and you keep the profit, but usually not the stake itself.
Odds Boost
A promo where the sportsbook temporarily bumps up the odds on a market, giving you a bigger potential payout.
Profit Boost
A promo that bumps up the profit on a winning bet by a set percentage (like +50%) — not the same as an odds boost.
Qualifying Bet
A bet you have to place to unlock a promo, usually with minimum odds and stake rules attached.
Reload Bonus
A deposit bonus for existing customers on later deposits, as opposed to a first-time sign-up bonus.
Risk-Free Bet
A promo where the book refunds your stake — usually as a bonus bet — if your first wager loses.
Site Credit
Non-withdrawable funds added to your account to place bets, where winnings are usually withdrawable as cash.
Wagering Requirements (Rollover)
How many times you have to bet a bonus or deposit before you can cash out the winnings.