Bye-bye Definition
bībī, bī-bī
interjection
Used to express farewell.
American Heritage
(informal, often childish) Goodbye.
Wiktionary
adverb
Away.
American Heritage
To bed; to sleep.
American Heritage
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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