mutton chop mut·tonc·hop uncommon noun 1. chop cut from a mature sheep Synonymsmutton chop 2. beard grown down the side of a man''s face in front of the ears (especially when the rest of the beard is shaved off) Synonymssideburnburnsidemutton chopside-whiskers Related words Broader terms beardchop WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.