linesman

noun lines·man \ˈlīnz-mən\

: 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

Full Definition of LINESMAN

: lineman 1

: an official who assists a referee (as in football or hockey) especially in determining if a ball, puck, or player is out-of-bounds or offside

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1883

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