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N-COUNT（可数名词） An ump is the same as an . 裁判 [美国英语][非正式]
...the home plate ump changed his call, saying Jedkins had stepped on the plate trying to bunt.
… 本垒裁判改变了他的判罚，说杰德金斯已经踏上了本垒板试图触击。
V-I（不及物动词） Ump is also a verb. 当裁判
"I'll ump," said Jerry.
“我来当裁判，”杰瑞说。