English dictionary bye-bye meaning and definition Definition and meaning of bye-bye at MeaningMonkey.org. bye-bye meaning and definition in the English Dictionary. BYE-BYE nounDefinition of bye-bye (noun)a farewell remark"they said their good-byes"synonyms: adieu, adios, arrivederci, au revoir, auf wiedersehen, bye, cheerio, good day, goodby, good-by, goodbye, good-bye, sayonara, so long Source: Princeton University Wordnet
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