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Related to stay up: stay up late
1. To remain awake beyond one's normal bedtime. I need to stop staying up so late—I can barely function at work! You go on to bed, I'm going to stay up for a little while and read.
2. To remain in public view. I hope those campaign posters don't stay up much longer, I'm so sick of looking at them. The decorations stay up on our neighbors' house months after the holidays are over.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
stay up (for something)
to remain awake and out of bed for some nighttime event. I will stay up for her arrival. I can't stay up that late.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. To remain awake: I stayed up all night reading.
2. To remain on display: Their Christmas tree stayed up until February.
3. To remain well informed: They stay up on current trends by reading fashion magazines. I don't know how doctors stay up with all the new research.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.