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Phrase(s): Good-bye and good riddance.
Cliché a phrase marking the departure of someone or something unwanted. • Fred: Supposing I was to just walk out of here, just like that? Mary: I’d say good-bye and good riddance. • As the garbage truck drove away, carrying the drab old chair that Mary hated so much, she said, "Good-bye and good riddance."
McGrawhill's American Idioms And Phrasal Verbs