| OTB |
Off Track Betting. Betting away from race track. |
| Octant |
Refers to five numbers adjacently placed on a Roulette wheel. |
| Odds |
Used to refer to a probability that one event will happen over another event. |
| Off |
Used to refer to a wager that is on the table but not active. |
| Off-Number Bet |
Craps wager that the shooter will throw or not throw a certain number before a seven. |
| Off Number |
Numbers in Craps including four, five, six, eight, nine, and ten. |
| Off-The-Top |
Used to refer to the beginning of the deck. |
| Off-The-Street |
Getting a job in a casino without the knowledge of anyone in the casino. |
| On |
A Craps wager at risk. |
| On Tilt |
A poor Poker player. |
| One Armed Bandit |
Refers to a slot machine. |
| One Down |
A gesture to inform that a die has fallen from the Craps table to the floor. |
| One Eyed Jack |
The use of Jack of Hearts and the Jack of Spades as wild cards in the game of Poker. |
| One Number Bet |
One Number Bet |
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