set (one's) teeth

set (one's) teeth

To be or become resolute and determined (to do something). Despite his ankle sprain, the batter stepped up to plate, set his teeth, and knocked the ball out of the park. We just need to set our teeth and do what needs to be done.
See also: set, teeth

set your teeth

1 clench your teeth together. 2 become resolute.
See also: set, teeth
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