Definition of bye-bye in English:

bye-bye

Syllabification: bye-bye

exclamation

informal way of saying goodbye.
More example sentences
  • These motions need to be slow, however - you don't want it to look like you're waving bye-bye; you want it to look like your fingers are gently weaving in an almost hypnotic pattern.
  • So, these are certainly things that people want to check out, if they would like to pop over for dinner, just stay the evening, and say, nice seeing you, bye-bye.
  • So fine, he gives me the cd, I give him my business card so he can contact me and get it back, he gives me his phone number, I have to go to my appointment, bye-bye.

Origin

early 18th century: child's reduplication.

Definition of bye-bye in:

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Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music