Jisho

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Expressions (phrases, clauses, etc.), Godan verb with 'mu' ending
1. to regret bitterly; to be very sorry (for); to bite one's navelIdiomatic expression
Other forms
ほぞを噛む 【ほぞをかむ】臍を噬む 【ほぞをかむ】
Notes
臍を噬む: Rarely-used kanji form.

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