Definition of bye-byes noun from the Oxford Advanced Learner's Dictionary

 

bye-byes

 noun
noun
BrE
 
; NAmE
 
 
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Word Origin mid 19th cent.: from the sound bye-bye, long used as a refrain in lullabies.Idioms
go (to) bye-byes
 
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(British English, informal) used by small children or to small children, to mean ‘go to sleep’