knock out

Idioms & Phrases

knock out

  1. Also, knock out cold. Render unconscious by a blow or some other means. For example, It was just a swinging door, but it knocked her out, or Just one of those sleeping pills can knock you out cold. [Late 1500s]

  2. Make tired, exhaust, as in That sightseeing tour knocked me out.

  3. Render useless or inoperative, as in The storm knocked out the power.

  4. See knock off, def. 2.

  5. See knock oneself out.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Previous Definition: knock oneself out
Next Definition: knock over
Words Near: knock out
More from
Synonyms and Antonyms for knock out
More from
Search for articles containing knock out
More from Translator Word FAQs presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.

Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature