Definition of bye-byes in English:

bye-byes

noun

mass noun
  • A child's word for sleep.

    ‘definitely not the book to read before bye-byes’
    • ‘I shut my computer off at the wall every night before bye byes otherwise the router is blazing out all night.’
    • ‘He thinks that it's like when you say it's time to go bye-byes.’
    • ‘‘Two seconds baby. Then you can have a nice warm drink before bye-byes.’’

Origin

Mid 19th century: from the sound bye-bye, long used as a refrain in lullabies.

Pronunciation

bye-byes