[ I ] to burn brightly either for a short time or not regularly（短暂地）旺烧；（摇曳着）燃烧

[ I ] also flare up When something bad such as violence, pain, or anger flares (up), it suddenly starts or gets much worse.（暴力、疼痛或愤怒）爆发，突发，加剧

[ I or T ] to (cause to) become wider（使）张开，（使）展开

[ C ] a sudden increase in the brightness of a fire（突然的）旺火；（闪耀的）火光

[ C ] a very bright light or coloured smoke that can be used as a signal, or a device that produces this闪光信号灯；彩色烟雾信号；闪光装置；照明弹

[ C usually singular ] the fact of something, especially clothing, becoming wider at one end（衣服）逐渐张开，呈喇叭形展开