Definition of bye-bye
—used to express farewell
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Origin and Etymology of bye-bye
baby-talk reduplication of goodbye
NEW! Time Traveler
First Known Use: circa 1736
in the meaning defined above
See Words from the same yearDefinition of bye-bye
: out especially for a walk or ride
—used with the verb go
First Known Use of bye-bye
1917
First Known Use of bye-bye
1867
Definition of bye-bye
: to bed or sleep
—used with the verb go
First Known Use of bye-bye
1909
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