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’
    • ‘‘Two seconds baby. Then you can have a nice warm drink before bye-byes.’’
    • ‘He thinks that it's like when you say it's time to go bye-byes.’
    • ‘I shut my computer off at the wall every night before bye byes otherwise the router is blazing out all night.’

Origin

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

Pronunciation:

bye-byes

//