歯はぎしり

noun, noun or participle which takes 'suru', intransitive verb

bruxism; involuntary tooth grinding

Medical and everyday term for grinding one's teeth, especially during sleep. Often used with する to describe the action.

• 夜よ中なかに歯はぎしりをしていると言いわれた。

  I was told that I grind my teeth at night.

• 歯はぎしりがひどくて、朝あさ起おきるとあごが痛いたい。

  My bruxism is so bad that my jaw hurts when I wake up in the morning.

noun, noun or participle which takes 'suru', intransitive verb

grinding one's teeth in anger or frustration

Describes the conscious or unconscious act of clenching or grinding teeth due to strong negative emotions like anger, resentment, or vexation. Often used in literary or dramatic contexts.

• 彼かれは悔くやしさに歯はぎしりをして、拳こぶしを握にぎりしめた。

  He ground his teeth in frustration and clenched his fists.

• 上じょう司しに叱しかられて、歯はぎしりしながら耐たえた。

  Scolded by his boss, he endured it while grinding his teeth.