sit out
To not take part in.
The next dance is a polka. Let's sit it out.
Toby had to sit out the last half of the game because his knee hurt.
sit through
To watch or listen until (something) is finished.
The show was so boring that we could hardly sit through the first act.
Elaine liked the movie so much that she sat through three showings.
sit tight
To make no move or change; stay where you are. Often used as a command.
Sit tight; I'll be ready to go in a few minutes.
The doctor said to sit tight until he arrived.
The gangsters sat tight in the mountains while the police looked for them.
sit up and take notice
To be surprised into noticing something.
Grace had never impressed her teachers. Hearing that she had won the essay contest made them sit up and take notice.
George's sudden success made the town sit up and take notice.
sit up for
To wait until after the usual bedtime for someone's return.
Mrs. Smith always sits up for her two daughters, no matter how late it is.
sit up with
To be with; particularly to keep someone ill company.
Mrs. Brown sat up with her sick husband all night in the hospital room.
sit up
To move into a sitting position.
Joe sat up when he heard the knock on his bedroom door.
To stay awake instead of going to bed.
Mrs. Jones will sit up until both of her daughters get home from the dance.
We sat up until two A.M. hoping for news from Alaska.
To be surprised.
Janice really sat up when I told her the gossip about Tom.
sit with
sit well with
To be accepted by; affect. Used in interrogative sentences and in negative sentences modified by well.
How did your story sit with your mother?
Bob's poor sportsmanship doesn't sit well with the coach.
Find favor with; please.
The reduced school budget did not sit well with the teachers.