Wiktionary
sit on
vb. 1 (context idiomatic English) To block, suppress, restrain. 2 (context idiomatic informal English) To restrain (a person). 3 (context idiomatic English) To take no action on 4 To be a member of
Usage examples of "sit on".
Santos scooted down to sit on the end of her spine and plucked at her lower lip.
I don't care how you do it, but you sit on the Shaman for three more weeks.
We will sit on that little mound there, overlooking the beach, and review the case.