To grind between the teeth.
to gnash the air in fury
To clash together violently.
There they were, boiling up in snowy spouts of spray, smiting and gnashing together like the gleaming teeth of hell.
A sudden snapping of the teeth.
From Middle English gnasten. Origin unknown; the word is probably either Germanic or onomatopoeic. Compare Old Norse gnastan, Danish gnaske ("munch", "crunch"), German knirschen, German Low German gni...
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