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brain someone

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Hit someone hard on the head. For example, The roof collapsed and a bunk of plaster brained him, or I'll brain you if you don't get to those dishes! This term is used both literally (first example) and hyperbolically (second example). [Slang; 1930s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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