There are 2 definitions of stay up in English:

stay up1

Not go to bed: they stayed up all night
More example sentences
  • I was beyond tired, probably due to the fact that my mother had made me stay up all night waiting for Chris to get home.
  • One lady blamed the library for her sleepless nights, claiming once she has borrowed a good book she stays up all night till she finishes it.
  • He gets more leg spasms during the night so he stays up gaming to take his mind off the pain.
See parent entry: stay

Definition of stay up in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal

There are 2 definitions of stay up in English:

stay-up2

Line breaks: stay-up

noun

(usually stay-ups)
A stocking that has an elasticated top and stays in position without a need for suspenders.
More example sentences
  • The tops of stay-up's have a skin-friendly coating, which prevents slipping.