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kayo

[key-oh, key-oh; verb key-oh]Slang.
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noun, plural kay·os, verb, kay·oed, kay·o·ing.
  1. KO.
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Origin of kayo

An Americanism dating back to 1920–25

KO

or K.O., k.o., kay·o

[noun key-oh, key-oh; verb key-oh]Slang.
noun, plural KO's.
  1. a knockout in boxing.
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verb (used with object), KO'd, KO'ing.
  1. to knock unconscious, especially in a boxing match; knock out.
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Origin of KO

First recorded in 1920–25; initial letters of knock out
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

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British Dictionary definitions for kayos

kayo

KO

slang
noun plural kayos
  1. boxing another term for knockout
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verb kayoes, kayos, kayoing or kayoed
  1. boxing another term for knock outSee knockout (verb)
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Word Origin

C20: from the initial letters of knock out

KO

k.o.

verb KO's, KO'ing, KO'd, k.o.'s, k.o.'ing or k.o.'d
  1. a slang term for knock outSee knockout
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noun plural KO's or k.o.'s
  1. a slang term for knockout
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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

Word Origin and History for kayos

kayo

spelled-out form of K.O. (knockout), from 1923. Also used in 1920s as a slang reversal of OK.

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Online Etymology Dictionary, © 2010 Douglas Harper