Head linesman

[Merna]

Head linesman in Canadian Football. Has a supervisory role in charge of the linesman. Also logs the downs, keeps a record of the substitutions and controls the scrimmage line and sideline.

[Carollacob]

a football official in charge of recording yardage gained or lost

[Ernestdyday]

The chief, senior or most authoritative of a group of linesmen officiating at a match.

[Dave Paprocki]

A head linesman is a designated official in various sports, particularly in American football, whose primary responsibility is to monitor and ensure the proper placement of the line of scrimmage and track the down and distance during a game. The head linesman also assists with calling penalties and rules infractions. In 2017, the National Football League (NFL) renamed this position as down judge.