Focus on the pronunciation of goodbye
English definition of “goodbye”
/gʊdˈbɑɪ/ exclamation, n [C/U] (short form bye /ˈbɑɪ/, infml bye-bye /bɑɪˈbɑɪ/)
› 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?