referee
/ˌrefəˈri:; ˌrɛfə`ri/ n
1 (also infml 口语作 ref) (in football, boxing, etc) official who controls matches, prevents rules being broken, etc （足球、 拳击等的）裁判员. =>illus at hockey 见 hockey 插图. Cf 参看 umpire.
2 person to whom disputes, eg between employers and employees, are referred for decision （争端, 如劳资纠纷的）仲裁者, 调解者, 公断者.
3 (Brit) person willing to make a statement about the character or ability of sb applying for a job （愿为求职者提供证明的）证明人, 介绍人, 推荐人
The head teacher often acts as
(a) referee for his pupils. 这位校长常为求职学生做证明人. referee, v [I, Tn]
act as a referee(1) in (sth) 当裁判
Who refereed (the match)? 谁当（这场比赛的）裁判?