What is the origin of the idiom "free hand" and when to use it?

The origin of the idiom "free hand" can be traced back to the concept of physical hand movements representing unrestricted actions. It metaphorically signifies granting someone the freedom to act without constraints or interference. The phrase draws upon the idea that when one's hand is free, it can move and act independently, guided solely by the individual's own choices and decisions. This phrase is commonly used in discussions about leadership, creativity, and decision-making processes.