linesman
US /ˈlaɪnz.mən/
UK /ˈlaɪnz.mən/
1.
an official who assists the referee in some sports (such as soccer or American football) by indicating when the ball or a player is out of play
:
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The linesman raised his flag for offside.
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A good linesman needs excellent vision and quick reflexes.
2.
a person who installs or repairs telegraph or telephone lines
:
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The linesman was working to restore power after the storm.
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He started his career as a young linesman for the telephone company.