bye-bye
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bye-bye
(bī′bī′, bī-bī′)interj.
Used to express farewell.
adv. Informal
1. Away.
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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
bye-bye
(interj. ˈbaɪˈbaɪ; n., adv. ˈbaɪˌbaɪ)interj.
1. good-bye.
n. 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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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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 farewell, word of farewell - an acknowledgment or expression of goodwill at parting |
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Translations
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
bye-bye
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007