giri-giri
The harsh grinding sound of teeth clenching together, or hard surfaces scraping under pressure — teeth grinding in sleep, or a heavy object being dragged.
💡Grinding teeth during sleep — 'He grinds his teeth giri-giri every night.'
寝ている間に歯をぎりぎり鳴らしている。
He grinds his teeth giri-giri in his sleep.
She was so frustrated she was ___ grinding her teeth.
悔しくて歯を○○と食いしばった。