Poker Glossary

Poker terms beginning with a "O"


The odds of winning a hand. Take a careful look at our probability page, as it's essential for poker players to learn this as quickly as possible.

Odds Against

The likelihood of a particular outcome not occurring, often used to assess drawing hands.


Offsuit refers to cards of different suits. Often you'll see an "o" when reading card combinations. For example: KhJd (King of Hearts Jack of Diamonds) are offsuit and will also often be referred to as KJo.

One Gap

A hand with two cards separated by one rank, such as 8 of Any Color and 10 of Any Color.

One Chip Rule

In live poker, placing a single oversized chip in the pot is typically considered a call unless the player verbally announces a raise.

On the Button

The position of the dealer, which is considered the most advantageous position at the poker table. Also see dealer.


Omaha is similar to Hold'em, but players receive exactly four pocket cards, of which two must be used.

Omaha Hi-Lo (Omaha 8 or Better)

A variation of Omaha where the pot is split between the best high hand and the best qualifying low hand (8 or lower).

Open Card

A card that is dealt face up for all players to see, common in Stud games.

Open Ended Straight

A straight draw consisting of four connected cards. It can be completed with a card on either the low or high end. For example: with 5 of Any Color 6 of Any Color 7 of Any Color 8 of Any Color, either a 4 of Any Color or a 9 of Any Color can complete the straight.

Open Ended Straight Draw

Another term for open ended straight, referring to a straight draw where a card at either end can complete the straight.

Open Limp

To enter the pot by calling the big blind when no one else has raised before you.

Open Raise

An open raise is the first raise in a betting round, typically made by the player in early or middle position.


A complete rotation around the table, with each player having had the dealer button once, is called an orbit.


To improve your hand to beat an opponent's hand, often on the turn or river.

Out Button

The out button is used to mark players seated at a table but currently not involved in the game.

Out of Position (OOP)

Acting before your opponent(s) in a betting round, considered a disadvantage.


Outs are all the cards that can complete your hand. The more outs you have, the better your chances. Study our page on calculating outs carefully because it's important to understand this as quickly as possible.


When a tournament's guaranteed prize pool exceeds the total buy-ins from players, the extra amount is called the overlay.

Over Card

A card higher than any card on the board. For example, if you hold an ace on a board of 9 of Any Color 7 of Any Color 4 of Any Color, your ace is an overcard.

Over Bet

An over bet means betting more than the amount currently in the pot.

Over Pair

If the rank of the cards forming your pocket pair is higher than all the cards on the table, you have an over pair. For example: you have King of Spades King of Hearts and the board shows 6 of Spades 9 of Hearts Queen of Clubs. See also under pair.

Over the Top

To re-raise another player's raise, often used to describe an aggressive play.