Hold/put a gun to somebody's head - Idioms by The Free Dictionary
hold/put a gun to somebody's head
hold a gun to (one's) head
To force or pressure someone to do something. Kristina, you don't have to move if you don't want to—no one's holding a gun to your head.
hold/put a ˈgun to somebody’s head force somebody to do something that they do not want to do by making threats: He had to sack a hundred workers last week. He didn’t want to, but the bank was holding a gun to his head.