Definition of flasher noun from the Oxford Advanced American Dictionary

     

    flasher

     noun
    noun
    NAmE//ˈflæʃər//
     
     
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  1. 1 (informal) a man who shows his sexual organs in public, especially in order to shock or frighten women
  2. 2a device that turns a light on and off quickly
  3. 3 a light on a vehicle that you can turn on and off quickly as a signal four-way flashers (= four lights that flash together to warn other drivers of possible danger)
See the Oxford Advanced Learner's Dictionary entry: flasher