gnash one's teeth
To grind or strike the teeth together in anger, signaling extreme rage, frustration, pain, or ferocity.
gnash
UK /ˈnæʃ/ US /ˈnæʃ/
verb 4noun 1
Definitions
verb
1
To grind (one's teeth) in pain or in anger.
gnashing your teeth
2
To grind between the teeth.
to gnash the air in fury
The dog was gnashing a carpet
3
To clash together violently.
There they were, boiling up in snowy spouts of spray, smiting and gnashing together like the gleaming teeth of hell.
4
To run away.
noun
1
A sudden snapping of the teeth.
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