/ Dictionary / Index G gnash: Meaning and Definition of Find definitions for: gnash Pronunciation: (nash), [key] — v.t. to grind or strike (the teeth) together, esp. in rage or pain. to bite with grinding teeth. —v.i. to gnash the teeth. —n. an act of gnashing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gnash (Thesaurus) gnarly gnat Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language