There are 2 main definitions of KO in English:

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KO 1

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Entry from British & World English dictionary

abbreviation

Kick-off.

Definition of KO in:

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There are 2 main definitions of KO in English:

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KO 2 Syllabification: KO
Pronunciation: /ˌkāˈō/
Boxing , informal

noun

A knockout in a boxing match. See also kayo.

verb (KO's, KO'ing, KO'd)

[with object] Back to top  
Knock (an opponent) out in a boxing match.
Example sentences
  • Conn had KO'd his last four opponents, including heavyweights Buddy Knox and Gunnar Barlund, both in the 8th rounds.
  • It's sort of like when Buster Douglas KO'd Mike Tyson.
  • Those days may have ended when Mike Tyson got KO'd by Buster Douglas.

Origin

1920s: abbreviation.

Definition of KO in:

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