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Use "good-by" in a sentence
"Having read of his sailing in the morning papers, Bernard Higginbotham, Gertrude, and all the family came to say good-by, as did Hermann von Schmidt and Marian."
""Found your valley of the moon yet?" the writer's wife asked, as they were saying good-by."
"An 'ye cried in me arms an' wuddent kiss yer old Matt good-by."