[key-oh, key-oh; v. key-oh] Slang.
noun, plural kayos, verb, kayoed, kayoing.

1920–25, Americanism

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World English Dictionary
kayo or slang KO (ˈkeɪˈəʊ)
n , pl kayos
1.  boxing another term for knockout
vb , kayos, kayoes, kayos, kayoing, kayoed
2.  boxing See knockout another term for knock out
[C20: from the initial letters of knock out]
KO or slang KO
[C20: from the initial letters of knock out]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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