What is the meaning of Round_up?

To collect or gather (something) together.

To gather (livestock such as cattle, sheep, geese, etc.) together, such as by encircling them.

To arrest or detain a group of people based on collective (rather than individualized) cause or suspicion, often as a form of targeted persecution.

To round (a number) to the smallest integer that is not less than it, or to some other greater value, especially a whole number of hundreds, thousands, etc.

Source: wiktionary.org