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goodbye

 
/gʊdˈbɑɪ/ exclamation, n [C/U] (short form bye /ˈbɑɪ/, infml bye-bye /bɑɪˈbɑɪ/)

Definition

› said when you are going away from someone else, or the act of saying this when you are going away: [U] Goodbye, Roberto, and thanks again for a great dinner. [U] Don’t go without saying goodbye to me, will you?
(Definition of goodbye exclamation, n from the Cambridge Academic Content Dictionary © Cambridge University Press)

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