k o'ed


[n. key-oh, key-oh; v. key-oh] Slang.
noun, plural KO's.
a knockout in boxing.
verb (used with object), KO'd, KO'ing.
to knock unconscious, especially in a boxing match; knock out.
Also, K.O., k.o., kayo.

1920–25; initial letters of knock out

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
KO or k.o. (ˈkeɪˈəʊ)
vb , KO's, KO'ing, KO'd, k.o.'s, k.o.'ing, k.o.'d
1.  See knockout a slang term for knock out
n , KO's, KO'ing, KO'd, k.o.'s, k.o.'ing, k.o.'d, KO's, k.o.'s
2.  a slang term for knockout
k.o. or k.o.

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

KO definition

and kayo
  1. n.
    a knockout. (The abbreviation is an initialism. Boxing.) : It was a quick KO, and Wilbur was the new champ.
  2. tv.
    to knock someone out. (See also KOed. Boxing.) : Wilbur planned to KO Wallace in the third round.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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American Heritage
Abbreviations & Acronyms
  1. Coca-Cola Co.

  2. knockout

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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