grit one's teeth

Idioms  

1. Summon up one's strength to face unpleasantness or overcome a difficulty. For example, Gritting his teeth, he dove into the icy water. This expression uses grit in the sense of both clamping one's teeth together and grinding them with effort. [Late 1700s]

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Example Sentences

Instead one may opt to grit one's teeth and bear the discomfort—for example, if a reward is at stake.

From Scientific American • Jun. 16, 2023

There was nothing to do but grit one's teeth and take chances.

From Sweetapple Cove by Van Schaick, George