Definition of linesmen:
(n) :
(soccer) An assistant referee.
(n) :
(ice hockey) An official whose primary task is to watch the blue line and determine when there has been an offside.
(n) :
(American football) An official whose primary task is to determine whether there has been a line of scrimmage violation.
(n) :
A person employed to work on electrical lines; a lineman.
(n) :
(tennis, dated) A male line judge.
(n) :
(military) A private in the line.