A-Z Reference

Sports Betting Glossary

Every term an Ohio sports bettor needs to know; defined in plain English. Bookmark this page for reference and follow the links to deeper guides on each topic.

A

Action
A wager that's officially live, or the total amount being wagered on a market. "Action bet" means a bet that stands regardless of changes (e.g., MLB starting pitcher swaps).
Against the Spread (ATS)
A team's win-loss record measured by whether they covered the point spread, not whether they won outright. Used to evaluate handicapping performance. Point Spread Guide →
Alt Line
An alternative spread or total offered at modified odds. Example: Bengals -3.5 -110 (standard), Bengals -6.5 +130 (alt line at longer odds).
American Odds
The standard odds format in US sportsbooks. Negative numbers indicate favorites (-150 = bet $150 to win $100). Positive numbers indicate underdogs (+200 = bet $100 to win $200). How to Read Odds →
Arbitrage (Arb)
Placing bets on all outcomes of an event at different sportsbooks where price differences guarantee profit. Most Ohio sportsbooks prohibit "guaranteed" arbitrage strategies.

B

Backdoor Cover
When a team scores a meaningless late touchdown or basket that covers the spread despite losing the game. The "backdoor" is the unlikely covering path for the underdog.
Bad Beat
A bet that loses on a freak late-game play after appearing certain to win. Common in NFL where a meaningless garbage-time score swings the spread.
Bankroll
The total amount of money set aside specifically for sports betting. Sharp bettors keep it separate from their primary checking account. Bankroll Management →
Bet Slip
The in-app section where you build, review, and confirm wagers. Holds your selections before you finalize the bet.
Bonus Bet
A non-cashable token issued by a sportsbook as part of a welcome offer or promotion. When wagered, only the profit returns on a win; not the stake. Bonus Terms Decoded →

C

Cash Out
Settling a bet before the event concludes for a reduced payout. Sportsbooks price cash-outs with a built-in margin in their favor.
Chalk
The favorite in a given matchup. "Betting chalk" means consistently backing favorites.
Closing Line
The final odds offered on a market before the event starts. Beating the closing line consistently is the strongest predictor of long-term profitability. Sharp Betting Guide →
Closing Line Value (CLV)
The difference between the price you got and the closing line. Positive CLV (you got a better price than the close) is the key metric sharp bettors track.
Cover
When a team wins by enough to beat the spread (for favorites) or stays close enough to beat the spread (for underdogs).

D

Decimal Odds
Odds format expressing total return per $1 wagered. 2.50 decimal = $100 wager returns $250 total ($150 profit). Standard in Europe.
Dog
Short for underdog. The team or player expected to lose, identified by + odds (e.g., +200).
Double Result
A bet on which side leads at halftime AND wins outright. Both must hit for the bet to cash.

E

EV (Expected Value)
The mathematical average outcome of a wager over infinite repetitions. A +EV bet wins more than 50% of the time relative to its implied probability.
Edge
A bettor's mathematical advantage over the market. Quantified as % above 50% implied probability after accounting for vig.

F

Favorite
The team or player expected to win, identified by - odds (e.g., -180). Must overcome the spread when wagered against the line.
First Bet Offer
A welcome bonus that protects your first qualifying wager. If it loses, the sportsbook refunds the stake as bonus bets. Common at BetMGM, bet365, Caesars in Ohio.
Flat Betting
Wagering the same unit size on every bet regardless of confidence. The most disciplined bankroll approach for most bettors.
Fractional Odds
Odds format expressing profit-to-stake (5/2 = $2 wins $5 profit). Standard in UK horse racing, rare in US sports betting.
Futures
A wager on an event that will resolve weeks or months in the future; championships, division winners, MVPs, season win totals. Futures Betting Guide →

G

Geolocation
GPS and Wi-Fi-based location verification that confirms a bettor is physically within Ohio state lines. Required before every wager at every Ohio sportsbook.
Grand Salami
A futures-style bet on the combined total goals/runs/points scored across all games on a given day or slate.

H

Handicap
Another term for spread. To handicap a game means to predict how outcomes will compare to the spread.
Handle
The total dollar amount wagered at a sportsbook (or in a state) over a defined period. Ohio handle was $963 million in March 2026.
Hedge
A second bet on the opposite side of an existing wager to lock in profit or limit loss. Common with futures and live betting. Hedge Calculator →
Hold
The sportsbook's built-in margin (also called vig or juice). Ohio sportsbooks typically run 4-9% hold on standard markets. Hold Calculator →
Hook
A half-point added to a spread (e.g., -3.5 instead of -3). Eliminates the possibility of a push.

I

Implied Probability
The probability of an outcome derived from the odds. -150 implies a 60% chance of winning; +200 implies 33.3%.
In-Play Betting
Wagering while a game is in progress with constantly updating odds. Also called live betting. Live Betting Guide →

J

Juice
The sportsbook's commission on a wager (also called vig or hold). Standard -110 NFL spread juice means you risk $110 to win $100.

K

Kelly Criterion
A mathematical formula for optimal bet sizing based on edge and odds. Useful in theory but most bettors overestimate edge; fractional Kelly is safer.

L

Limit
The maximum stake a sportsbook will accept on a given market. Sharp accounts often have their limits reduced or get banned.
Line Movement
How odds change between opening and closing. Driven by money flow, injuries, weather, and sharp action.
Line Shopping
Comparing the same market across multiple sportsbooks and betting at the best price. The highest-leverage habit for moving from square to sharp.
Live Betting
See In-Play Betting. Live Betting Guide →
Lock
A "guaranteed winner" claim, virtually always made by people who lose money long-term. There are no locks in sports betting.
Long Shot
An underdog with very long odds (+1000 or longer), typically futures markets.

M

Middle
When two different sportsbooks post different spreads/totals such that you can win both wagers if the final result lands between them. Rare but valuable.
Moneyline
A wager on which team wins outright, with no spread. Identified by + odds (underdog) or - odds (favorite). Moneyline Guide →

N

No-Sweat Bet
Another term for first-bet protection. If your first wager loses, the stake is refunded as bonus bets.
No-Vig Fair Odds
The implied probability of a market with the sportsbook's margin removed. Used as a proxy for true probability when finding +EV bets.

O

Off The Board (OTB)
A market a sportsbook has removed from offering, usually due to injury news or extreme line movement.
Over/Under
A totals bet on whether the combined final score will be more or less than the listed total. Totals Guide →

P

Parlay
A wager combining multiple bets into one. Every leg must win for the parlay to cash. Higher payouts but lower win probability. Parlay Guide →
Point Spread
A handicap given by the favorite (must win by X+) or to the underdog (must lose by less than X or win outright). Point Spread Guide →
Prop Bet
A wager on a specific outcome within a game that isn't directly tied to the final score. Player props are most popular (passing yards, anytime TD, etc.). Prop Bets Guide →
Public Money
Wagers placed by recreational bettors. Public money tends to favor chalk, overs, and primetime games.
Puck Line
NHL's version of a spread, always set at 1.5 goals. Favorite at -1.5, underdog at +1.5.
Push
A tie between the final result and the spread/total. Pushes refund the original wager.

R

Reverse Line Movement (RLM)
When a line moves against the majority public betting percentage. Indicator that sharp money is on the unpopular side.
Round Robin
A parlay variation that breaks selections into multiple smaller parlays. Picking 4 teams as 3-pick round-robin creates 4 separate 3-leg parlays.
Run Line
MLB's version of a spread, always set at 1.5 runs. Favorite at -1.5, underdog at +1.5.

S

Same Game Parlay (SGP)
A parlay where every leg comes from the same game. Available at DraftKings, FanDuel, BetMGM, Caesars, and most major Ohio sportsbooks. Parlay Guide →
Sharp
A winning bettor who beats the closing line consistently. Sharps prioritize CLV over short-term win-loss. Sharp Betting Guide →
Square
A recreational bettor, typically loses long-term. Squares favor chalk, parlays, and high-juice prop bets.
Steam
A sharp, sudden line movement caused by a large or coordinated bet hitting the market.

T

Teaser
A modified parlay that adjusts spreads or totals in the bettor's favor at reduced payout. Common in NFL and NBA.
Total
See Over/Under. Totals Guide →

U

Underdog
The team or player expected to lose, identified by + odds (e.g., +200). Wins outright less than 50% of the time.
Unit
A standardized bet size, typically 1-2% of total bankroll. Using units makes tracking ROI easier across changing bankroll sizes. Bankroll Management →

V

Vig (Vigorish)
The sportsbook's commission, also called juice or hold. Standard NFL spread vig is -110 (you risk $110 to win $100).

W

W-2G
IRS tax form issued by sportsbooks when a single win exceeds $600 and is at least 300x the wager. You owe tax on all winnings regardless of W-2G issuance. Tax Calculator →
Welcome Bonus
A promotional offer for new sportsbook account holders. Common types in Ohio: bet & get, first-bet protection, daily reset, deposit match. Best Ohio Bonuses →

Y

Yardage Prop
A player prop on total yards (passing, rushing, receiving). Common in NFL betting. Banned in college football in Ohio as of February 2026.