knockout

[ nok-out ]
/ ˈnɒkˌaʊt /

noun

adjective

that knocks out: the knockout punch.

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Origin of knockout

1810–20; 1935–40 for def. 4; noun, adj. use of verb phrase knock out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for knockout

knockout
/ (ˈnɒkˌaʊt) /

noun

verb knock out (tr, adverb)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Idioms and Phrases with knockout

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