HSK 7-9
复发
fùfā动
to recur (of a disease); to reappear; to relapse (into a former bad state)
天气转冷可能使旧病复发。
Tiān qì zhuǎn lěng kě néng shǐ jiù bìng fù fā.
Colder weather may cause the old illness to recur.
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Appears across levels (7-9) in the HSK 3.0 word list.