Every term on this page connects directly to the mechanics of an over under bet. Learn these 12 definitions and the math behind the lines stops being a mystery.
What Are the Core Over Under Betting Terms?
Start with totals betting basics for context, then use this glossary as a quick reference whenever a term comes up on the sportsbook's bet slip.
- Over/Under (Total)
- The combined score both teams must beat (Over) or stay below (Under). The sportsbook sets the number; you pick a side.
- Juice / Vig / Vigorish
- The sportsbook's commission built into the odds. Standard is -110 on each side of a total. See the full breakdown on the over under odds and payouts page.
- Implied Probability
- The win percentage the posted odds suggest. At -110, the implied probability is approximately 52.38% — the break-even rate a bettor must beat to profit long-term. Covered in depth at implied probability for totals bettors.
- Overround
- The sum of implied probabilities on both sides of a market. At -110/-110, this equals roughly 104.76%; the extra 4.76% is the book's margin. Game totals carry the lowest overround of any bet type — far less than futures and props.
- Push
- When the combined score lands exactly on a whole-number total. All bets are refunded in full — no winner, no loser. Full rules at push and hook explained.
- Hook
- The half-point (.5) added to a total line (e.g., 47.5) to eliminate the possibility of a push. A hook forces a definitive outcome.
- Alternate Totals
- Modified total lines — higher or lower than the main line — offered at adjusted odds. Useful when you want to shade a position; see alternate totals strategy for when they make sense.
- Sharp Action
- Large wagers from professional bettors. Sharp money often moves the posted total before game time.
- Line Movement
- A change in the posted total driven by sharp bets, public money, or new information such as injuries or weather. Tracked at line movement on totals.
- Parlay
- Combining two or more bets — including totals — into one wager. Every leg must win for the parlay to pay out.
- Expected Value (EV)
- The projected average profit or loss per bet relative to true probability. Positive EV means the bet carries long-run value over the book's price. Negative EV means the vig is eating your edge.
- No-Vig / Fair Line
- The "true" odds after stripping the book's margin. Sharp bettors use it to identify whether a posted total has value. Reduced juice lines at -105 cut the book's hold from ~4.76% to ~2.38%, moving closer to the fair line.
Why Does the -110 Standard Matter?
At -110, a $110 wager returns $100 profit. That standard price is why every term above — vig, overround, implied probability — anchors around the same number. Read -110 odds explained for the exact payout math and break-even calculation.
Asymmetric pricing (e.g., Over -120 / Under +100) signals that sharp action has moved one side; the asymmetric juice guide explains what lopsided odds tell you before you bet.
Must be 21+ to wager (18+ in select states). Gambling problem? Call 1-800-GAMBLER.