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Wiktionary
bye-bye

interj. (label en informal often childish) goodbye. n. 1 (context colloquial often childish English) A goodbye. 2 (context colloquial often childish English) bedtime for a toddler, go to sleep, go to bed.

WordNet
bye-bye

n. a farewell remark; "they said their good-byes" [syn: adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara, so long]

Wikipedia
Bye-Bye (novel)

Bye-Bye is the first novel by Jane Ransom, for which she won the 1996 New York University Press Prize for Fiction. It was published by the New York University Press.

Bye-Bye (film)

Bye-Bye is a 1995 French drama film directed by Karim Dridi. It was screened in the Un Certain Regard section at the 1995 Cannes Film Festival.

Usage examples of "bye-bye".

Paul Anthony Heaven had also played the threatening supervisor in Wave Bye-Bye to the Bureaucrat, the Massachusetts State Commissioner for Beach and Water Safety in Safe Boating Is No Accident, and a Parkinsonian corporate auditor in Low-Temperature Civics.

Take your bikes—they'll be debited from your future accounts—wave bye-bye and blow lasses because we are off in one minute.

Take your bikes-they'll be debited from your future accounts-wave bye-bye and blow lasses because we are off in one minute.

She takes a quarter from her purse and surveys the numbers, which run from one to thirty-four and include such ringers as FREE SPIN, BYE-BYE NICE TRY, and double zero.

Couple of months learning all over again to go potty, wave bye-bye.

It came on then, big and ugly: bye-bye Bleichert at the bus stop, adios shitbird, has-been, never-was, stool pigeon niggertown harness bull.