sit

Work or act as a baby-sitter.

“I cannot baby-sit tonight; I have too much homework to do”

Serve in a specific professional capacity.

Show to a seat; assign a seat for.

Be seated.

Sit and travel on the back of animal, usually while controlling its motions.

Be around, often idly or without specific purpose.

Take a seat.

Assume a posture as for artistic purposes.

Be in session.

“When does the court of law sit?”

Be located or situated somewhere.

“The White House sits on Pennsylvania Avenue”