Definition of hey exclamation from the Oxford Advanced American Dictionary

     

    hey

     exclamation
    exclamation
    NAmE//heɪ//
     
    (informal)
     
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  1. 1used to attract someone's attention or to express interest, surprise, or anger Hey, can I just ask you something? Hey, leave my things alone!
  2. 2 (informal) used to say hello Hey, Tony, how's it going?
  3. 3used to show that you do not really care about something or that you think it is not important That's the third time I've been late this week — but hey! — who's counting?
  4. Idioms
    what the hey!(informal)
     
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    used to say that something does not matter or that you do not care about it This is probably a bad idea, but what the hey!
See the Oxford Advanced Learner's Dictionary entry: hey

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