gnash one's teeth

idiom

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.

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“Gnash one's teeth.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/gnash%20one%27s%20teeth. Accessed 13 December 2019.

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