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English definition of “hey”

hey

exclamation     /heɪ/ informal
A2 used as a way of attracting someone's attention, sometimes in a way that is not very polite: Hey! What are you doing with my car? Hey, are you guys coming to Angela's party?Sounds used as interjectionsInterjections
(Definition of hey exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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