wait up

phrasal verb·1 sense·particle up

Meanings

1

Stay awake until someone arrives home

Why “up”? You stay at the needed level, pace, or state.

Don't wait up for me.
Don't stay awake for me.
Dad waited up until I got home.
Dad stayed awake until I got home.

Don't confuse with

wait upwait on

Wait up means stay awake until someone arrives home. Wait on means serve customers in a restaurant.

wait upwait out

Wait up means stay awake until someone arrives home. Wait out means stay until a difficult situation ends.

Test yourself

Don't wait up for me. What does it mean?

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