What Is the Definiton of "coach"

To me the definition of a  coach is someone that is always there pushing you, sometimes up, sometimes down but they are always there trying to push you forward with all the effort they have. a couch is someone that doesnt give up are teaching you to succeed. They teach you moves to get past the brick walls that try and slow you down and the drop off cliffs that try and make you fall. the coach just pick you back up and keep you moving forward.