intransitive verb
grist·​bite | \ˈgrizbə̇t\

Definition of gristbite 

dialectal, chiefly British

: to grind or gnash the teeth

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History and Etymology for gristbite

Middle English grisbiten, from Old English gristbitian, from grist-bite act of gnashing, from grīst act of grinding + bite biting, from bītan to bite

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