referee’s assistant

noun
🔊/ˌrefəriːz əˈsɪstənt/
🔊/ˌrefəriːz əˈsɪstənt/
(also assistant referee)
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  1. (in football (soccer)足球) the official name for a linesman (= an official who helps the referee, for example in deciding whether or where a ball has passed outside the field of play)助理裁判(边线裁判员的正式名称)Topics Sports: ball and racket sportsb2