If you are not trying to legitmately imprive your position, top or bottom, it' stalling. If top is dominating and not attempting to improve his posution it is stalling.

Several years ago I saw the New Jersey State tournament on TV. Probably 75% of the matches were pushed along by stall calls. Lots of matches reversed in the last seconds due to stall calls forcing the action. The refs looked like a bunch saluting Nazi's playing switch'em. Every match a scramble, the best HS wrestling I have seen. Plus, every wrestler announced as going to a major college wrestling program.