umpire
noun [ C ] uk/ˈʌm.paɪər/ us/ˈʌm.paɪr/
（体育比赛中的）裁判
a person who is present at a sports competition in order to make certain that the rules of that particular game are obeyed and to judge if particular actions are acceptable
a cricket/tennis umpire 板球／网球裁判