WordReference Random House Learner's Dictionary of American English © 2017
KO /n. ˈkeɪˈoʊ, ˈkeɪˌoʊ; v. ˈkeɪˈoʊ/USA pronunciation   n., pl.  KOs or KO's, v.,  KO'd, KO'•ing. 
n. 
  1. Sporta knockout in boxing: [countable]five KOs to his credit.[uncountable]winner by KO.

v. [+ object]
  1. Sportto knock unconscious in boxing;
    knock out:KO'd in one round.
Often,  K.O., k.o. 
WordReference Random House Unabridged Dictionary of American English © 2017
KO  (n. kāō, kāō′;v. kāō),USA pronunciation n., pl.  KO's, v.,  KO'd, KO'ing. [Slang.]
n. 
  1. Sporta knockout in boxing.

v.t. 
  1. Sportto knock unconscious, esp. in a boxing match;
    knock out.
Also,  K.O., k.o., kayo. 
  • initial letters of knock out 1920–25

WordReference Random House Learner's Dictionary of American English © 2017
kay•o /ˈkeɪˈoʊ, ˈkeɪˌoʊ/USA pronunciation   n., pl.  -os, v.,  -oed, -o•ing. 
  1. SportSee KO.

WordReference Random House Unabridged Dictionary of American English © 2017
kay•o  (kāō, kāō′;v. kāō),USA pronunciation n., pl.  kay•os, v.,  kay•oed, kay•o•ing. [Slang.]
  1. SportSee  KO. 
  • 1920–25, American.


Collins Concise English Dictionary © HarperCollins Publishers::

KO, k.o. /ˈkeɪˈəʊ/ vb (KO's, KO'ing, KO'd, k.o.'s, k.o.'ing, k.o.'d)
  1. a slang term for knock out
    See knockout
n ( pl KO's, k.o.'s)
  1. a slang term for knockout



kayo, KO /ˈkeɪˈəʊ/ slang n ( pl kayos)
  1. another term for knockout
vb (kayoes, kayos, kayoing, kayoed)
  1. another term for knock out
    See knockout (verb)
Etymology: 20th Century: from the initial letters of knock out



'KO' also found in these entries:
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