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)