linesman  
noun [ C ] uk/ˈlaɪnz.mən/ us/ˈlaɪnz.mən/  -men uk/-mən/ us
  (SPORTS)     
  边线裁判员,巡边员
an official in some sports who is responsible for deciding when the ball has crossed the line that marks the edge of the playing area
   (POWER LINES)     
 (US lineman)电话线修理工;电线修理工 
a person whose job is to repair phone and electricity lines