Jisho

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Noun
1. assistant umpire; assistant refereeSports
Wikipedia definition
2. Assistant referee (association football)"Linesman" redirects here. For an assistant referee/linesman in ice hockey, see Official (ice hockey). In association football, an assistant referee is one of several officials who assist the referee in controlling a match. Two officials, traditionally known as linesmen (or lineswomen if they are female), stand on the touchlines, while a fourth official assists administrative or other match related tasks as directed by the referee.
Read “Assistant referee (association football)” on English Wikipedia
Read “副審” on Japanese Wikipedia
Read “Assistant referee (association football)” on DBpedia

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