Dictionary.com
definitions
  • synonyms

KO

or K.O., k.o., kay·o

[noun key-oh, key-oh; verb key-oh]Slang.
See more synonyms for KO on Thesaurus.com
noun, plural KO's.
  1. a knockout in boxing.
Show More
verb (used with object), KO'd, KO'ing.
  1. to knock unconscious, especially in a boxing match; knock out.
Show More

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

Related Words

hit, beat, tap, punch, slap, hurt, smack, fell, batter, flatten, damage, whack, bash, annihilate, expunge, exterminate, ravage, erase, eliminate, smash

British Dictionary definitions for koing

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
Show More
noun plural KO's or k.o.'s
  1. a slang term for knockout
Show More
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