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bye-bye

[interjection bahy-bahy; noun, adverb bahy-bahy] /interjection ˈbaɪˈbaɪ; noun, adverb ˈbaɪˌbaɪ/
interjection
1.
Informal. goodbye.
noun
2.
Baby Talk. sleep.
Idioms
3.
go bye-bye, Baby Talk.
  1. to leave; depart; go out.
  2. to go to sleep; go to bed.
Origin of bye-bye
1700-1710
1700-10; apparently orig. nursery phrase used to lull a child to sleep, later construed as reduplicative form of bye, short for goodbye
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Slang definitions & phrases for bye-bye

bye-bye

noun

Good-bye: bye-bye for now (1867+)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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8
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