HSK 7-9
发作
fāzuò动
to flare up; to break out
他的旧病在深夜突然发作。
Tā de jiù bìng zài shēn yè tū rán fā zuò.
His chronic illness suddenly flared up late at night.
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Appears across levels (7-9) in the HSK 3.0 word list.