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.

U

;UA or U.A.

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:Abbreviation for Union Association, a one-year (1884) major league.

Related Topics:
Union Association - 1884

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;Uncle Charlie

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:A slang term used to describe a curve ball.

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;up and in

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:Same as high and tight.

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;up the middle

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:On the field very close to second base, used to describe the location of batted balls. Also, in a more general sense, the area of the field on the imaginary line running from home plate through the pitcher's mound, second base, and center field.

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;upper decker

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:A home run that lands in the stadium's upper deck of seating.

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