bye-bye

[ interjection bahy-bahy; noun, adverb bahy-bahy ]

/ interjection ˈbaɪˈbaɪ; noun, adverb ˈbaɪˌbaɪ /

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interjection

Informal. goodbye.

noun

Baby Talk. sleep.

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Idioms about bye-bye

go bye-bye, Baby Talk.

1700–10; apparently originally nursery phrase used to lull a child to sleep, later construed as reduplicative form of bye, short for goodbye

The bye bye is being sung, incidentally, by mothers to their babies condemned to death by King Herod.
Yes, I Like Christmas Music. Stop Laughing.|Michael Tomasky|December 24, 2014|DAILY BEAST
Her very first performance onstage came at the age of 4, when she cameoed as a dancing flower in the musical Bye Bye Birdie.
Jena Malone’s Long, Strange Trip From Homelessness to Hollywood Stardom|Marlow Stern|December 22, 2014|DAILY BEAST
“Good bye boys, I die a true American,” were his last words, according to the headstone.
Brooklyn’s Gangster Graveyard|Nina Strochlic|October 23, 2014|DAILY BEAST
I never knew how long he would last before he said, “Okay, bye.”
A Full-Length Bill Cosby Portrait: From Track Star to Ugly Sweaters|Scott Porch|September 24, 2014|DAILY BEAST

They were calling out to family and friends, asking if there was anything that could be done, and in some cases, saying good-bye.
The Resilient City: New York After 9/11|John Avlon|September 11, 2014|DAILY BEAST
Here were the sources (in part) of the Po and of the Rhine, but I was rather in haste to bid the former good-bye.
Glances at Europe|Horace Greeley
"Yes," said Punch, lifted up in his father's arms to wave good-bye.
Kipling Stories and Poems Every Child Should Know, Book II|Rudyard Kipling
Good-bye, then, Miss Warrender; parting is such sweet sorrow, I e'en could say good-bye until to-morrow.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
You had better go to him, Dolly, and bid him good bye, before he takes the team to the field.
The World Before Them|Susanna Moodie
Colonial charters were, however, "undoubtedly no more than those of all corporations, which empower them to make bye-laws."
The Eve of the Revolution|Carl Becker