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knockout

[nok-out] /ˈnɒkˌaʊt/
noun
1.
an act or instance of knocking out.
2.
the state or fact of being knocked out.
3.
a knockout blow.
4.
Informal. a person or thing overwhelmingly attractive, appealing, or successful.
5.
a panel in a casing, can, or box, especially of metal or plastic, so designed that it can readily be removed, as by punching, hammering, or cutting, to provide an opening into the interior:
a knockout in a junction box.
6.
Machinery. a device for knocking something loose, as finished work from a lathe chuck.
adjective
7.
that knocks out:
the knockout punch.
Origin of knockout
1810-1820
1810-20; 1935-40 for def 4; noun, adj. use of verb phrase knock out
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for knockout

knockout

/ˈnɒkˌaʊt/
noun
1.
the act of rendering unconscious
2.
a blow that renders an opponent unconscious
3.
  1. a competition in which competitors are eliminated progressively
  2. (as modifier): a knockout contest
4.
a series of absurd invented games, esp obstacle races, involving physical effort or skill
5.
(informal) a person or thing that is overwhelmingly impressive or attractive: she's a knockout
verb (transitive, adverb)
6.
to render unconscious, esp by a blow
7.
(boxing) to defeat (an opponent) by a knockout
8.
to destroy, damage, or injure badly
9.
to eliminate, esp in a knockout competition
10.
(informal) to overwhelm or amaze, esp with admiration or favourable reaction: I was knocked out by that new song
11.
to remove the ashes from (one's pipe) by tapping
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
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Word Origin and History for knockout
n.

also knock-out, in fighting, 1887, from verbal phrase knock out "to stun by a blow for a 10-count" in boxing, short for to knock out of time; see knock (v.) + out. Slang meaning "attractive person" is from 1892. To knock oneself out "make a great effort" is from 1936.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for knockout

knockout

modifier

: That was a knockout plot/ a knockout wife and two daughters

noun

An especially attractive person or thing; dish: Saaay, you know, you're a knockout (1906+)

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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18
21
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