Are there any other ways to say “don’t wait up”?
The phrasal verb "wait up" in this situation means to stay up late waiting for someone. So "don't wait up" is a short way to say, "don't stay up late waiting for me", and it implies that the person won't be back until very late in the night. You can also say "don't wait for me to come back to go to sleep". There are many combinations of ways to say this.
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