Meaning of 肝胆相照す in Japanese
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肝胆
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Definition of 肝胆相照す
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(exp, v5s) to be profoundly compatible; to be inseparable; to be so close as to reveal to each other the bottom of one's heart
彼とは学生時代から肝胆相照らす仲だよ。
He and I have been inseparable friends since our student days.