Source : Webster's Revised Unabridged Dictionary (1913)

Round-up \Round"-up`\, n.
   The act of collecting or gathering together scattered cattle
   by riding around them and driving them in. [Western U.S.]

Round-up \Round"-up`\, n.
   1. A rounding up, or upward curvature or convexity, as in the
      deck of a vessel.

   2. A gathering in of scattered persons or things; as, s
      round-up of criminals. [Colloq., U. S.]