Definitions for "Assistant Referee"
An official used in the Diagonal System of Control (DSC) to help the center referee. Assistant referee duties are spelled out in the Guide to Procedures for Referees, Assistant Referees, and Fourth Officials. Assistant referees are most often assigned to games where the players are age 16 years old or older.
Formerly called linesman. Patrols the sidelines or touch line; duties include determining when balls are out of bounds, which team touched last touched it, and whether a player or team is offside.
prior to 1996 they were known as linesmen/lineswomen. There are two per game. Their job mainly consists of signaling out of bounds, goal kicks, corner kicks, and offsides positions and to assist the Center referee. See also Linesmen and Linesperson.