sit up with

sit up with (one)

To stay awake past one's normal bedtime in order to care for someone. My daughter kept vomiting, so I had to sit up her through the night.
See also: sit, up

sit up with someone

to stay with someone through the night, especially with a sick or troubled person or with someone who is waiting for something. I had to sit up with my younger sister when she was ill. I sat up with Bill while he waited for an overseas telephone call.
See also: sit, up
References in periodicals archive ?
Bend your knees and sit up with your hands behind your head.