はが
歯噛み
1. grinding of the teeth; involuntary nocturnal tooth grinding; bruxism
2. grinding one's teeth out of anger or vexation; gnashing one's teeth; gritting one's teeth
歯がみ 【はがみ】、歯嚙み 【はがみ】
歯嚙み: Rarely-used kanji form.
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