Definition of linesman noun from the Oxford Advanced American Dictionary

 

linesman

 noun
noun
NAmE//ˈlaɪnzmən//
 
(pl. linesmen
NAmE//ˈlaɪnzmən//
 
)
 
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an official who helps the referee in some games that are played on a field or court, especially in deciding whether or where a ball crosses one of the lines.
See the Oxford Advanced Learner's Dictionary entry: linesman