KO

• POS: Noun

CIDE DICTIONARY

KO, n. 

 a knockout; a blow that renders the opponent unconscious; -- used especially in boxing.  [WordNet 1.5]

KO, v. t. 

 To knock out; to deliver a blow that renders (the opponent) unconscious; -- used especially in boxing.  [WordNet 1.5]

OXFORD DICTIONARY

KO, abbr.
1 knockout.
2 kick-off.

THESAURUS

KO

Cadmean victory, Pyrrhic victory, anesthetize, ascendancy, bedaze, benumb, besot, blackout, blunt, call off, cancel, catalepsy, catatonia, catatony, championship, chloroform, clincher, coldcock, coma, complete, conquest, cook, crusher, deaden, death stroke, deathblow, defeat, delete, desensitize, dish, dispose of, do for, do in, dope, drop the curtain, drug, dull, easy victory, end off, end-all, ender, etherize, expunge, extinguish, faint, final stroke, finalize, finish, finisher, finishing stroke, fix, fold up, freeze, get it over, get over with, get through with, give the quietus, grand slam, grayout, kayo, kayo punch, kibosh, kill, knock out, knock senseless, knock stiff, knock unconscious, knockout, knockout blow, landslide, landslide victory, last dab, lay out, lipothymia, lipothymy, mastery, moral victory, narcotize, nirvana, nirvana principle, nothingness, numb, oblivion, obliviousness, obtund, palsy, paralyze, perfect, picnic, polish off, pushover, put paid to, put to sleep, quietus, runaway victory, scrag, scuttle, semiconsciousness, senselessness, settle, settler, shoot down, sink, sleep, sockdolager, stopper, stun, stupefy, stupor, subdual, subduing, success, swoon, syncope, torpedo, total victory, triumph, unconsciousness, undo, victory, walkaway, walkover, win, winning, winning streak, wipe out, zap