GNASH, verb transitive nash. To strike the teeth together, as in anger or pain; as, to gnash the teeth in rage. GNASH, verb intransitive nash. To grind the teeth. He shall gnash with his teeth and melt away. Psalms 112:10. 1. To rage even to collision with the teeth; to growl. They gnashed on me with their teeth. Psalms 35:16.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI