To dictate how a situation or agenda proceeds, as from a position of authority. My staff has to do what I say because I'm the boss, and I call all the shots here! Mom calls the shots for Thanksgiving dinner, so you better get her approval for any dish you want to bring.

To dictate how a situation or agenda proceeds, as from a position of authority. The phrase is a shortened version of "Who pays the piper calls the tune," which means that the person who pays for something assumes control over it. My staff has to do what I say because I'm the boss, and I call the tune here! Mom calls the tune for Thanksgiving dinner, so you better get her approval for any dish you want to bring.