Used to express farewell.
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."
(informal, often childish) Goodbye.
To bed; to sleep.
Webster's New World
(colloquial, often childish) A goodbye.
(colloquial, often childish) Bedtime for a toddler, going to sleep, going to bed.
Idioms, Phrasal Verbs Related to Bye-bye
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