Meaning of 臍を噛む in Japanese
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臍
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噛む
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Definition of 臍を噛む
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(exp, v5m) to regret bitterly; to be very sorry (for)
彼女は姑の気にさわるようなことを言わなければよかったと臍を噛んだ。
She bitterly regretted having said something that displeased her mother-in-law.