To fail to uphold one's moral integrity or principles during their later years; to not maintain one's good character until the end of one's life.
他年轻时正直清廉，却没想到晚年为了个人私利而晚节不终，令人惋惜
He was upright and honest in his youth, but unexpectedly failed to maintain his integrity in his later years for personal gain, which is truly regrettable.
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