outbreak
noun [ C ] uk/ˈaʊt.breɪk/ us/ˈaʊt.breɪk/
C2 （尤指疾病、危险或不快之事的）发作，暴发，突然发生
a time when something suddenly begins, especially a disease or something else dangerous or unpleasant
an outbreak of cholera/food poisoning/rioting/war 霍乱／食物中毒／骚乱／战争的暴发
Last weekend saw further thundery outbreaks. 上周末仍然雷声不断。