bye-bye
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\ ˈbī-ˌbī 
, bī-ˈbī \
, bī-ˈbī \variants:
or by-by
Definition of bye-bye
(Entry 1 of 4)
—used to express farewell
bye-bye
adverb (1)\ ˈbī-ˌbī \
\variants:
or by-by
Definition of bye-bye (Entry 2 of 4)
: out especially for a walk or ride
—used with the verb go
bye-bye
noun\ ˈbī-ˌbī \
\variants:
or by-by
bye-bye
adverb (2)\ ˈbī-ˌbī \
\variants:
or by-by
Definition of bye-bye (Entry 4 of 4)
: to bed or sleep
—used with the verb go
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Time Traveler for bye-bye
The first known use of bye-bye was circa 1736
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