remain up

remain up

1. To continue to be at a raised or higher position. The flags should remain up throughout the entire ceremony. Don't lower them until everyone has left the stage. I don't want our Christmas lights remaining up all the way into the spring like they did last year!
2. To continue to be displayed in a prominent place or position. The judge ruled that the inflammatory posters could remain up, as they were under the protection of the first amendment. She apologized for her rude remarks on social media, but they remained up for days afterward.
3. To continue to be awake. My mom usually remains up until around 12 o'clock, so we definitely won't be able to sneak out without her noticing. You're always complaining about how tired you are, so I don't know why you remain up so late each night.
See also: remain, up
Farlex Dictionary of Idioms.

remain up

to stay awake and out of bed. I remained up throughout most of the night. I cannot remain up much longer.
See also: remain, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • reach back into (some point in time)
  • reach back to
  • reach back to (some point in time)
  • like piffy on a rock bun
  • like piffy on a rock cake
  • piffey
  • piffy
  • hammer and sickle
  • shed a tear
  • get spliced