EXAMPLES FROM THE WEB FOR GNASH
Then she would stare at the child and gnash her teeth as though with hate.
Men and women will gnash their teeth against their own children.
Coming back in the cars, I had a rencontre that makes me gnash my teeth yet.
With them I can with one gnash divide a knight in half at the waist.
He did so; Jeanne hearkened; and then it was Sweder's turn to gnash his teeth.
All the world must respect our tapus, or we gnash our teeth.
He would hunt for me, and gnash his teeth at the escape of his prey.
So the North Wind could only gnash his teeth, and say, "Whoo, whoo!"
They fall into a rage, and gnash with their teeth, as they do not dare openly to shout.
All at once he put his hand on his sword, and gnash his teeth.
early 15c., variant of Middle English gnasten "to gnash the teeth" (c.1300), perhaps from Old Norse gnastan "a gnashing," of unknown origin, probably imitative. Cf. German knistern "to crackle." Related: Gnashed; gnashing.