grit one's teeth

verb2

1. •
   To clench one's teeth together tightly because of pain, anger, frustration, or self-assurance.

   • [Shield Knight] LOOKED WITH DREAD THROUGH THE EYES OF THE ENCHANTRESS. SHE WAS TRAPPED AGAIN! SHIELD KNIGHT GRIT HER TEETH. SHOVEL KNIGHT WOULDN'T GIVE UP, AND NEITHER WOULD SHE. — 2019
2. •
   To face up to a difficult or disagreeable situation and deal with it.

   • There's a storm coming, so I grit my teeth and start rowing with all my might.