Origin of Gnash
From Middle English gnasten. Origin unknown; the word is probably either Germanic or onomatopoeic. Compare Old Norse gnastan, German knirschen, German Low German gnirschen, gnörschen.
Alteration of Middle English gnasten, gnaisten possibly of Scandinavian origin Old Norse gnastan a gnashing
From American Heritage Dictionary of the English Language, 5th Edition
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