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1.
A small, insignificant excuse for a football referee who runs up and down the line making Hitler style salutes whenever a player is deemed to be in breach of the mystical offside rule.
The linesman has flagged for offside
That linesman is Goddam useless
by Ferg February 04, 2004
 
2.
Workers in the electrical distribution or transmission industry who string and join powerlines, both overhead and underground. In some organisations, they can train to become "Live Linesmen", who are qualified to work on live voltages above 1000V AC RMS.
Extra linesmen had to be called in from other depots after the storm, with all the conductors down all over the region.
by CaptainSpaghetti July 20, 2008