List of baseball jargon

The following is an alphabetical list of selected unofficial terms, phrases, and other jargon used in baseball, and explanations of their meanings. See also baseball slang for slang in general usage that originated in baseball. For an exhaustive list, see The New Dickson Baseball Dictionary, by Paul Dickson.

O

;Ofer

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:A player who goes hitless in a game, or wears the collar, as in "0 for 4" (spoken as "oh for four") or however many at bats he took in the game.

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;"Onion"

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:Derisive nickname of the short-lived Union Association.

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;outside corner

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:Over the edge of home plate away from the batter, used to describe the location of pitches.

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;on-deck

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:The next batter due to bat, after the current batter; the second batter in order. The designated area for the on-deck batter is a circle 5 feet (1.5 m) in diameter, officially called the "next batter's box", and commonly called the "on-deck circle".

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