beat someone's brains out

beat (one's) brains out

1. To put forth one's maximum effort, especially for some activity that is or proves to be futile or unproductive. I've been beating my brains out trying to get a passing grade this semester, so failing by two measly points is incredibly frustrating. Don't beat your brains out trying to please these people—they'll never appreciate it.
2. To physically attack one, as with punches and other blows, such that they suffer significant injury. This phrase can be used both literally and hyperbolically. I'm worried that the captain of the football team will beat my brains out if he finds out that I'm secretly seeing his girlfriend. As if I didn't feel bad enough after losing the case, my boss beat my brains out for it once I got back to the office.
See also: beat, brain, out
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

beat someone’s brains out

1. tv. to beat someone severely. She threatened to beat my brains out.
2. tv. to drive oneself hard (to accomplish something). I beat my brains out all day to clean this house, and you come in and track up the carpet!
See also: beat, brain, out
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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