outbreak

1. N-COUNT If there is an outbreak of something unpleasant, such as violence or a disease, it suddenly starts to happen. (暴動、疾病等的) 爆發

The four-day festival ended a day early after an outbreak of violence involving hundreds of youths. 由於一起數百名年輕人蓡與的暴力事件的爆發，爲期4天的慶祝活動提前1天結束。

...an outbreak of chickenpox. …水痘的暴發。