assistant referee
US /əˌsɪs.tənt ˈref.ə.ri/
UK /əˌsɪs.tənt ˈref.ə.ri/

1.
assistent-scheidsrechter
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.
De assistent-scheidsrechter stak de vlag omhoog voor buitenspel.
•
The decision was confirmed by the assistant referee.
De beslissing werd bevestigd door de assistent-scheidsrechter.