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Entry 2 senses · 2 variants Webster, 1913

KO

· IPA /ˈkəʊ/
01 n. a knockout; a blow that renders the opponent unconscious; -- used especially in boxing.
  1. 1.
    a knockout; a blow that renders the opponent unconscious; -- used especially in boxing.[acronym]
Syn. knockout.
02 v. t. To knock out; to deliver a blow that renders (the opponent) unconscious; -- used especially in boxing.
imp. & p. p. KO'd; p. pr. & vb. n. KO'ing
  1. 1.
    To knock out; to deliver a blow that renders (the opponent) unconscious; -- used especially in boxing.[acronym]
Syn. knockout.