Gnash is a verb that describes the sound of grinding teeth. It can also refer to the act of grinding one's teeth, which is often done in anger or frustration. The crossword solutions for the term Gnash are GRIND (5 letters), BITE (4 letters), and GRATE (5 letters). GRIND refers to the sound of grinding teeth, BITE refers to the act of biting down on something, and GRATE refers to the sound of scraping or rubbing against something. All three words are related to the term Gnash, as they all describe the sound of grinding teeth or the act of grinding one's teeth.