noun, plural linesmen.
an official, as in tennis and soccer, who assists the referee.
Football. an official who marks the distances gained and lost in the progress of play and otherwise assists the referee and field judge.
Ice Hockey. either of two officials who assist the referee by watching for icing, offside, and substitution violations and fouls and by conducting face-offs.
lineman ( def 1 ).

1855–60; line1 + 's1 + -man Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
linesman (ˈlaɪnzmən)
n , pl -men
1.  an official who helps the referee or umpire in various sports, esp by indicating when the ball has gone out of play
2.  chiefly (Brit) US and Canadian name: lineman a person who installs, maintains, or repairs telephone or electric-power lines

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Example sentences
But the referee did confer with the linesman and then meted out the punishment.
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