Question 1

What does "stay up" mean?

Accepted Answer

To remain awake instead of going to bed, especially later than usual

Question 2

How do you use "stay up" in a sentence?

Accepted Answer

The children begged their parents to let them stay up to watch the New Year's fireworks.

Question 3

Is "stay up" formal or informal?

Accepted Answer

"stay up" is register-neutral — appropriate in both casual and formal contexts. Very common and used by all age groups. Children are often told they cannot 'stay up late'. Also used to describe waiting for someone or watching something. Can also refer to objects that remain in an upright or elevated position.

stay up

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