Grade 0 gnashing Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition verb. to grind or strike the teeth together as from rage Example Sentence The dog was gnashing his teeth at us. Synonyms grind; grate; crunch; grit Antonyms smile; relax Hear It! Say It! Write It! gnashing Switch to cursive Start Share with your friends: