The term 'FIELD Authority' can be broken down into two parts: UMP, a three letter acronym, and the word 'FIELD'. UMP stands for 'UMPIRE', which is a person who officiates a sporting event. Umpires are responsible for making sure that the rules of the game are followed and that the players are playing fairly. They also make decisions on plays that are not clear-cut, such as whether a ball was caught or not. FIELD Authority is a term used to describe the authority that an UMPIRE has over the FIELD of play. Umpires are expected to maintain order and enforce the rules of the game, and they have the power to eject players from the game if necessary.