Bye-bye Definition
bībī, bī-bī
interjection
Used to express farewell.
American Heritage
The definition of bye-bye is a baby-talk expression used when leaving or parting.
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."
YourDictionary
(informal, often childish) Goodbye.
Wiktionary
adverb
Away.
American Heritage
To bed; to sleep.
American Heritage
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noun
Goodbye.
Webster's New World
(colloquial, often childish) A goodbye.
Wiktionary
(colloquial, often childish) Bedtime for a toddler, going to sleep, going to bed.
Wiktionary
Idioms, Phrasal Verbs Related to Bye-bye
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