flash·er
noun/ˈflæʃə(r)/
/ˈflæʃər/
- (informal) a man who shows his sexual organs in public, especially in order to shock or frighten women
（男子）暴露狂 - a device that turns a light on and off quickly
闪光装置 - (North American English) a light on a vehicle that you can turn on and off quickly as a signal
（车用）闪光灯 - four-way flashers (= four lights that flash together to warn other drivers of possible danger)
四向闪光灯
- four-way flashers (= four lights that flash together to warn other drivers of possible danger)