Gnash

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|Psalms 112:10]].

1. To rage even to collision with the teeth; to growl.

They gnashed on me with their teeth. [[Psalms 35#16|Psalms 35:16]].