- Sports.
- an official, as in tennis and soccer, who assists the referee.
- an official who marks the distances gained and lost in the progress of play and otherwise assists the referee and field judge.
- 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).
- an official who helps the referee or umpire in various sports, esp by indicating when the ball has gone out of play
- a person who installs, maintains, or repairs telephone or electric-power lines
