I thought if you wanted someone to wait for you, you would say, "wait for me". However, I've heard/seen a lot of people speak/write "wait up" instead. Is "wait up" correct English?
According to Collins Cobuild Advanced Learner's English Dictionary:
- If you wait up, you deliberately do not go to bed, especially because you are expecting someone to return home late at night.
- If you ask someone to wait up, you are asking them to go more slowly or to stop and wait for you [AM, INFORMAL]