umpiring
vt.
为…做裁判（umpire的现在分词形式）;
例句:
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Hobbies: Playing, coaching and umpiring softball ; playing trumpet for various ensembles, bands and orchestras.
嗜好 ﹕ 垒球-垒球手, 教练, 裁判员?喇叭手-乐器小组, 乐队,管弦乐队.
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What is common to those two examples is that they were a consequence of perceived bad umpiring.
来自THETIMES
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Sir Matthew Pinsent, who is umpiring the race for the first time, was praying that it will be straightforward.
来自THETIMES