flameout
noun [ C ] US informal uk/ˈfleɪm.aʊt/ us/ˈfleɪm.aʊt/
（极度成功之后）突然失败，跌落
a failure that happens in a very sudden and noticeable way, usually after someone or something has been very successful
the spectacular flameout of once high-flying internet stocks 昔日高歌猛进的网络股的突然跌落