gnash one's teeth
Definition of gnash one's teeth
1 : to grind one's teeth together He gnashed his teeth in his sleep.
2 : to show one is angry, upset, etc. His opponents have been gnashing their teeth in/with frustration since he won the election. His election has caused some weeping and gnashing of teeth among his opponents.
Word by Word Definitions
: to strike or grind (as the teeth) together
: plural oftooth
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