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Difference between Grind one’s teeth and Grit one’s teeth

grind one’s teeth—have feelings of great anger or annoyance though not fully manifesting what one feels:

  • If there is one thing calculated to make British artists grind their teeth, it is to be faced with generalizations about national characteristics.

grit one’s teeth—endure pain, discomfort, etc. without complaint; accept a difficult situation and deal with it in a determined way:

  • He gritted his teeth and held on tightly to his assailant even as the rest of the gang rained blows on him.