To have a recurrence of an old illness; an old ailment relapses; an old problem or bad habit resurfaces.
爷爷最近感到身体不适，担心是多年前的旧病复发了。
Grandpa has been feeling unwell recently, worried that it might be a recurrence of an old illness from many years ago.
Era:
Early Modern
Frequency:
Synonym:
Story:
Xue Pan, at a banquet, made inappropriate advances towards Liu Xianglian. After being severely beaten by Liu Xianglian, he felt he had lost too much face to remain in the capital.
He then decided to go out and do business with his subordinates, seeking permission from his mother.
His mother was unsure, but Baochai believed he should be allowed to try.
She commented that if his old bad habits (his "old illness") were to recur, there would be nothing they could do; however, if he were to thoroughly reform himself, it would certainly be a positive outcome.
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