linesman /ˈlaɪnzmən/ noun plural linesmen
plural linesmen
Learner's definition of LINESMAN
[count]
: an official in a sport such as football, tennis, or hockey who decides if a ball, puck, or player has gone out of the proper playing area(橄榄球、网球、冰球等比赛中的)边线裁判员,司线员