grind (one's) teeth

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grind (one's) teeth

To internalize one's anger without expressing it externally. The image is that of a person literally grinding their teeth together out of anger. Don't just sit there, grinding your teeth—if you're mad at me, let's talk about it.
See also: grind, teeth
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

grind your teeth

If someone grinds their teeth, they are angry about something, but do not express their anger. We journalists, who once were just like him, grind our teeth as we contemplate his success. Note: You can also talk about grinding of teeth, teeth-grinding, and tooth-grinding. There has been much grinding of teeth about what is seen by the government as the harshness of the European Community's decisions. When you are a little boy of nine, your father can seem like a hero one minute, only to cause you tooth-grinding embarrassment the next.
See also: grind, teeth
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
See also:
References in classic literature ?
She was grinding her teeth and saying this over and over again when she heard her mother come out on the veranda with some one.
CLAIRE WALSH, 32, started taking Billy's Bud cannabis oil in a desperate bid to stop grinding her teeth in her sleep as a result of stress and anxiety.
Vogue says Spencer, 28 - the brother-in-law of Pippa Middleton - helps her tackle a condition which sometimes leaves her confined to the house or grinding her teeth uncontrollably.
And that helps her tackle a condition which at times confines her to the house and at others leaves her grinding her teeth uncontrollably.
Our daughter, five, has a nightly habit of locking her jaw and grinding her teeth in her sleep, especially during the first four hours of sleep.
just your ex-girlfriend grinding her teeth in the next boat SHOPPY WATERS Now be a sweetie and rub my back while I ring your Daddy with my order .