the activity of gathering livestock together so that they can be counted or branded or sold
"The ranchers began their morning by driving the cattle into a pen to start the annual roundup."
a summary list; as in e.g. "a news roundup"
"The morning broadcast opened with a quick weather and crime roundup before moving on to the main stories."
An activity in which cattle are herded together in order to be inspected, counted, branded or shipped.
"The rancher began the morning roundup by driving all the stray cattle back into the corral for inspection and branding."
In plain English: A roundup is when you gather all of something scattered around into one place to deal with it at once.
"The cattle farmer organized a large roundup to gather all his stray animals before winter."
Usage: In modern everyday English, the term has shifted from its original agricultural meaning of gathering livestock to refer generally to any organized collection or summary of information, such as a news roundup or a list of top stories. Use this word when describing an event where items are gathered together for review rather than simply counting them individually.
A city, the county seat of Musselshell County, Montana, United States, which served as a place for cattle roundups.
"The town of Roundup in Montana was historically known as a gathering place where cowboys would assemble their herds during annual cattle drives."
The word roundup is a deverbation of the phrase round up, meaning it was formed directly from that verb. It entered English by combining the action of gathering with the noun suffix to describe the event itself.