assistant referee

US /əˌsɪs.tənt ˈref.ə.ri/
UK /əˌsɪs.tənt ˈref.ə.ri/
"assistant referee" picture
1.

an official who assists the referee in a soccer match, typically by indicating when the ball is out of play or when a player is offside

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The assistant referee raised the flag for offside.
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The decision was confirmed by the assistant referee.
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linesmanlinewoman
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