a type of defense that assigns each defender to a particular area in front of or around his team's goal in which he is responsible for marking any attacker that enters; often used ...
a playing card-sized card that a referee holds up to warn a player for dangerous or unsportsmanlike behavior; also called a caution; 2 yellow cards in one game earns a player an ...
the 2 officials who assist the referee in making his decisions; they monitor the sidelines and goal lines to determine when a ball goes out of bounds and they carry a flag to ...