linesman
noun /ˈlaɪnzmən/
/ˈlaɪnzmən/
(plural linesmen
/ˈlaɪnzmən/
/ˈlaɪnzmən/
)- an official who helps the referee in some games that are played on a field or court, especially in deciding whether or where a ball crosses one of the lines. Linesmen are now officially called referee’s assistants in football (soccer).
（足球等比赛中的）边线裁判员，巡边员，司线员 - (British English) (North American English lineman)a person whose job is to repair phone or electricity power lines
架线工；线务员