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knock oneself out

Slang definitions & phrases for knock oneself out

knock oneself out

verb phrase
  1. To work very hard; do one's utmost: They like ''knocking themselves out'' for Variety
  2. To have a splendid and exhausting time: They knocked themselves out drinking and dancing

[1936s+; perhaps fr Yiddish aroysshlogn zikh]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with knock oneself out
.
Make a great effort, as in I was knocking myself out to finish on time. This expression also is put negatively, Don't knock yourself out, meaning “don't exert yourself; it's not worth that much effort.” [ c. 1930 ]
.
Enjoy yourself, have a good time, as in You're off to Europe? Knock yourself out. [ ; mid-1900s ]
Both usages allude to knocking oneself unconscious (see break one's ass
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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