Synonyms and related words :
KO, addle, anesthetize, bedaze, befuddle, bemuse, benumb, blunt, chloroform, coldcock, deaden, desensitize, dope, drug, dull, etherize, freeze, inebriate, intoxicate, kayo, knock out, knock senseless, knock stiff, knock unconscious, lay out, narcotize, numb, obtund, palsy, paralyze, put to sleep, stun, stupefy