n. jail. (From the term for a naval prison or a shipboard jail.) : Throw this jerk in the brig.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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1720, colloquial shortening of brigantine (q.v.). Apparently such vessels being used for prison ships led to extended meaning "a jail," first recorded 1852.