- 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."
A baby waves bye bye
bye-bye definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
bye-bye definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Used to express farewell.adverb Informal
- To bed; to sleep: “[Live Senate television is] a great way to go bye-bye. Pretty soon you're asleep” (William Proxmire).
Origin: Reduplication of bye2.
bye-bye - Phrases/Idioms
to depart; leave: a child's term