Also found in: Thesaurus, Medical, Idioms, Encyclopedia, Wikipedia.


 (kā-ō′, kā′ō′)
n. pl. kay·os Sports
A knockout in boxing.
tr.v. kay·oed, kay·o·ing, kay·os
1. Sports To knock out.
2. Slang To put out of commission.

[Pronunciation of KO.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.kayoed - knocked unconscious by a heavy blow
unconscious - not conscious; lacking awareness and the capacity for sensory perception as if asleep or dead; "lay unconscious on the floor"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.