bye-bye

The definition of bye-bye is a baby-talk expression used when leaving or parting.

(interjection)

An example of bye-bye is when a mother has a baby wave and see daddy off to work. She might say "tell Daddy bye bye."

See bye-bye in Webster's New World College Dictionary

noun, interjection

Informal goodbye

See bye-bye in American Heritage Dictionary 4

interjection

Used to express farewell.

adverb
Informal

Away.
To bed; to sleep: “[Live Senate television is] a great way to go bye-bye. Pretty soon you're asleep” (William Proxmire).

Origin:

Origin: Reduplication of bye²

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