Phrasal verb WAIT UP

WAIT UP

1. To wait up is to stay awake and not go to bed because you are waiting for someone. Examples of use:

1. I’ll be home late tonight. Don’t wait up for me.
2. What time did you get home last night? Your mother and I waited up for you until 2am.

2. Wait up! is something you say to someone if you want them to stop and wait for you.

Mainly American English

Examples of use:

1. Wait up! I’ll get my coat and come with you.
2. Wait up! I need to talk to you before you go.
3. Wait up! You’ve forgotten your briefcase.