From the verb phrase round up.
roundup (plural roundups)
- (US, agriculture) An activity in which cattle are herded together in order to be inspected, counted, branded or shipped.
- (law enforcement) The similar police activity of gathering together suspects to a crime.
- The summary to a news bulletin.
- An upward curvature or convexity, as in the deck of a vessel.
- (agriculture): muster (Australia, New Zealand)