The term 'UMP'S KIN' is a crossword solution that can be broken down into two words. The first word, 'REF', is a three-letter word meaning an official who enforces the rules of a game or sport. The second word, 'REFS', is a four-letter word meaning multiple referees. Together, the two words form the phrase 'UMP's kin', which is a slang term for a group of referees. UMP's kin is often used to refer to a group of officials who work together to ensure the rules of a game or sport are enforced.