
Wait up
Nightly Wait
Used when someone delays going to sleep to see or support another person.

Mom promised to wait up until I finished studying for my exam.
Caring Gesture
Implies concern for someone's well-being, showing you'll stay awake for them.

Don't rush. I'll wait up for you, drive safely.
Sincere Assurance
Offers comfort, suggesting that someone will not be alone upon return.

After her long trip, her husband said he'd wait up.
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