Troop·er, n.
 1. A soldier in a body of cavalry; a cavalryman; also, the horse of a cavalryman.
 3. A mounted policeman. [Australia]
 Note: The black troopers of Queensland are a regiment of aboriginal police, employed chiefly for dispersing wild aborigines who encroach on sheep runs.
 like a trooper, with energy, endurance, or enthusiasm; as, to work like a trooper.

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