Please explain the difference between the following two sentences. Please try to explain it in simple words. Thanks.

1:- Don't wait up for me.

2:- Don't wait for me.

  • In almost all contexts, Don't wait up for me specifically means Don't stay up past your normal bedtime waiting for me to arrive, just go to bed as usual. But if you're out with a group of friends, and you're falling behind because they're walking faster than you, you might include the (optional) preposition in imperative Wait up! to mean Hold up!, Rest up! Stop moving until I catch up with you. But we wouldn't normally extend the utterance to Wait up for me in such contexts. – FumbleFingers Reinstate Monica Feb 9 at 15:24

In my (British) English, wait up has only one meaning: "not go to bed while waiting for somebody to arrive or return".

I don't know if it is used in other ways in other varieties of English (there are many phrasal verbs with up).

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