When your child disobeys you for the millionth time and you are filled with great anger and you grind your teeth together in frustration, this is an example of gnash.
To gnash the air in fury.
To gnash a carpet.
Origin of gnash
- 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
- 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.