What is the origin of the idiom "have the edge over someone or something" and when to use it?

The origin of the phrase "have the edge over someone or something" can be traced back to the world of sports, particularly in horse racing and fencing. In horse racing, the term "edge" was used to refer to a horse that was considered to have a slight advantage over the other horses in the race. This advantage was often due to factors such as the horse's breeding, training, or previous performance. In fencing, having the "edge" referred to having the advantage of being able to strike the first blow, which was considered to be a significant advantage in a sword fight. It can be employed in sports, business, academics, or any other realm where competition or comparison exists.