a sudden expression of angry or violent feeling （怒气、激烈情绪等的）爆发 a flare-up of tension between the two sides 双方剑拔弩张
(of an illness 疾病 a sudden painful attack, especially after a period without any problems or pain 突发；（尤指）复发 the fact of a fire suddenly starting to burn again more strongly than before 骤燃；突然燃起更大的火焰 a flare-up of the bushfires 林区大火的猛燃