Betting Terms
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| Odds | The likelihood of the outcome occurring, stated in numbers form. |
| Off Lines | The difference of amount the Las Vegas pointspread has compared with the computerized mathematical line. |
| Off the board | In sports betting this is a game on which the bookmaker will not accept action. |
| Official Lines | The line that the bookmaker uses for wagering purposes. |
| One dollar | $100.00 in sports betting action. |
| Oddsmaker | A person who sets the betting odds. |
| Opening Line | The earliest line posted for a particular sporting event. |
| Outlaw Line | Term for the earliest line in sports betting. This is an overnight line that only a handful of players are allowed to bet into. |
| Over | In sports gambling the "over" is a sports bet in which the bettor guesses that the combined point total of two teams will be above a specified total. |
| Overlay | When the odds of a given proposition are more in favor of the bettor than the house. |
| Over & Under | A wager for the total score by both teams will more or less than the total posted by the sports book. |
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