(of an obscure person)amaze the world by one's successful maiden effort.精选汉英词典 商务印书馆
此鸟不飞则已,一飞冲天；不鸣则已,一鸣惊人.（of an obscure personPto amze the world with the first work e.e.make(or pwll off) a great coup 汉英双解成语词典 商务印书馆
Does not fly then already,as soon as flies flushes the day; Does not call then,has surprised people.