Meaning of 臍を固める in Japanese
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臍
を
固める
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Definition of 臍を固める
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(exp, v1) to make up one's mind (to do something); to resolve firmly (to do something)
彼は臍を固めて一世一代の大事業に乗り出した。
He resolved to embark on a once-in-a-lifetime enterprise.