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KO

or K.O., k.o., kay·o

[noun key-oh, key-oh; verb key-oh]Slang.
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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

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British Dictionary definitions for ko'd

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