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Directly above shot of referee and two ice hockey players in face-off
Johan Gustafsson/Maskot/Getty Images
Definition: One of two on-ice officials who drop the puck on most faceoffs, call icing and offsides, and break up fights. They can also call certain penalties, such as too many men on the ice, and consult with the referees on other penalty calls, but are subordinate to the referees. As the name indicates, they spend most of their time positioned at the red line or blue lines.

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