From Middle English croke, crok, from Old English *crōc (hook, bend, crook), from Proto-West Germanic *krōk, from Proto-Germanic *krōkaz (bend, hook), from Proto-Indo-European *greg- (tracery, basket, bend).

Cognate with Dutch kreuk (a bend, fold, wrinkle), Middle Low German kroke, krake (fold, wrinkle), Danish krog (crook, hook), Swedish krok (crook, hook), Icelandic krókur (hook).

crook (third-person singular simple present crooks, present participle crooking, simple past and past participle crooked)