godan verb (-ru), transitive verb
clench one's teeth; grit one's teeth
Used literally for clenching the teeth tightly, often in the phrase 歯を食いしばる. Also used figuratively for enduring hardship with determination.
痛みに耐えて、彼は歯を食いしばった。
He clenched his teeth, enduring the pain.
悔しさをこらえて、唇を食いしばった。
She bit her lip, holding back her frustration.
困難に直面しても、歯を食いしばって頑張ろう。
Even when facing difficulties, let's grit our teeth and do our best.