Dictionary 1. (v. t.) To strike or grind together in anger; as, to gnash the teeth\.2. (v. i.) To grind or strike the teeth together. Thesaurus bite bolus champ chaw chew chew the cud chew up chomp cud gnaw gob grind gum masticate morsel mouth mouthful mumble munch nibble nip quid ruminate snap swallow |