Use 'sit on' when referring to physical objects that can support your weight.

Physical Objects

'Sit on' is commonly used for public seating like benches or steps.

Public Seating

Sometimes 'sit on' is used figuratively or humorously for unusual seating.

Indicates holding off on a decision, usually for further consideration.

May imply negligence or deliberate delay in addressing an issue.

Suggests an active role in a group, often with a level of responsibility.

Can indicate the degree of involvement or investment in a committee or board.

Refers to controlling or holding back emotions, often in difficult situations.

Useful in professional contexts to describe maintaining composure.