What is the origin of the idiom "common ground" and when to use it?

The origin of the idiom "common ground" can be traced back to the concept of finding shared understanding or agreement between individuals or groups. The term "common" refers to something that is shared or mutually understood, while "ground" represents a foundation or basis. The idiom is used to suggest that people can establish a point of agreement or shared perspective, even if they have different opinions or backgrounds. It emphasizes the importance of finding areas of similarity or commonality to foster understanding and cooperation.