gnasht

Verb

gnash (third-person singular simple present gnashes, present participle gnashing, simple past and past participle gnashed)

1. (transitive) To grind (one's teeth) in pain or in anger.
   • gnashing your teeth

   Synonyms:

   chatter

2. (transitive) To grind between the teeth.
   • to gnash the air in fury
3. (figuratively) To clash together violently.
   • 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, →OCLC
4. (Geordie) To run away.

See all 5 meanings of gnash