n. a big argument; a brawl. : There was a big donnybrook at the concert, and the police were called.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
donnybrook
1852, from Donnybrook Fair, proverbial for carousing and brawling, held in County Dublin until 1855.