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third-person singular simple present gnashes, present participle gnashing, simple past and past participle gnashed
(transitive) To grind (one's teeth) in pain or in anger. examples
(transitive) To grind between the teeth. examples
(figurative) To clash together violently. quotations examples
There they were, boiling up in snowy spouts of spray, smiting and gnashing together like the gleaming teeth of hell.
1886 October – 1887 January, H[enry] Rider Haggard, She: A History of Adventure, London: Longmans, Green, and Co., published 1887
(Tyneside) To run away. examples
plural gnashes
A sudden snapping of the teeth. examples