Definition of "round up"

round up

verb
third-person singular simple present rounds up, present participle rounding up, simple past and past participle rounded up
1. (transitive) To gather (cattle) together by riding around them.
2. (transitive, idiomatic) To collect or gather (something) together.
  1. (transitive, informal) To arrest or detain a group of people based on collective (rather than individualized) cause or suspicion, often as a form of targeted persecution.
3. (transitive, arithmetic) 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.