Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Animalsfetlockfet‧lock /ˈfetlɒk $ -lɑːk/ noun [countable] HBAthe back part of a horse’s leg, just above the hoofOrigin fetlock (1300-1400) Probably from → FOOT1 + → LOCK2 “hair” ldoceonline.com