Crossword Genius

What one may do to teeth when one's angry (4)

Ross

I believe the answer is:

grit

(Other definitions for grit that I've seen before include "called for on icy roads" , "Coarse stone or sand" , "Fortitude" , "Courage; tiny stones" , "Courage - clench - small particle of stone" .)

I've seen this clue in The Guardian.
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