wait up

listen to the pronunciation of wait up
English - English
To stay awake waiting for somebody to return

I'll probably be out very late tonight, so don't wait up for me.

Wait

Hey, wait up a minute! I forgot my umbrella.

If you wait up, you deliberately do not go to bed, especially because you are expecting someone to return home late at night. I hope he doesn't expect you to wait up for him Don't wait up. = stay up
wait for someone to arrive, remain awake
If you ask someone to wait up, you are asking them to go more slowly or to stop and wait for you. I was running down the hill shouting, `Michael, Michael, man, wait up'. = wait
wait up
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