The crossword solutions for the term UMP KIN are REF, which stands for referee. A referee is an official who enforces the rules and maintains order in a variety of sports and other competitive activities. Referees are responsible for making sure that all players abide by the rules and regulations of the game, and they also have the authority to make decisions regarding penalties and other disciplinary actions. Referees are typically highly trained professionals who have extensive knowledge of the sport or activity they are officiating.