To fail to maintain one's moral integrity or principles in old age; to fall short or make a grave mistake at the final stage of one's life or an endeavor, thus damaging one's lifelong reputation.
他年轻时为人称道，却因晚年未能抵住诱惑而晚节不保，让人深感遗憾。
He was highly respected in his youth, but unfortunately, he failed to maintain his integrity in his later years by not resisting temptation, which is deeply regrettable.
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