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Used to express farewell.
2. To bed; to sleep: "[Live Senate television is] a great way to go bye-bye. Pretty soon you're asleep" (William Proxmire).
[Reduplication of bye.]
bye-bye(interj. ˈbaɪˈbaɪ; n., adv. ˈbaɪˌbaɪ)
2. Baby Talk. sleep.adv.
3. go bye-bye, Baby Talk. to leave; depart; go out.Idiom.
[1700–10; appar. orig. nursery phrase used to lull a child to sleep, later construed as reduplicative form of by2]
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|Noun||1.||bye-bye - a farewell remark; "they said their good-byes"|
cheerio, good day, goodby, good-by, goodbye, good-bye, sayonara, so long, adieu, adios, arrivederci, au revoir, auf wiedersehen, bye