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English definition of “gnash your teeth”

gnash your teeth

to bring your teeth forcefully together when you are angry: The monster roared and gnashed its teeth. humorous to complain angrily and noisily about something: The villagers gnashed their teeth about the council's decision to build a car park.
(Definition of gnash your teeth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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