DCHP-1 Online
line rider West, Hist. 
a horseman patrolling the Canada-U.S. border to head off whisky-traders, rustlers, and other undesirables.
- 1910 The "line riders," whether Mounted Policemen or special men engaged by stock-owners for this service, have plenty to do in frustrating their-wiles.
- 1910 The "line riders," whether Mounted Policemen or special men engaged by stock-owners for this service, have plenty to do in frustrating their-wiles.