The word shot can refer to many things-a doctor give you a shot, A gun fires a shot and a basketball player takes a shot, but who…
CALLS THE SHOTS
In the classroom the teacher calls the shots.
This idiom means: to make the decisions
This idiom has several different possible origins. It might come from warfare where the officer in charge tells the soldiers when to fire the shots or from basketball where the coach draws up the plays and tells players what shots to make.