round somebody/something ↔ up phrasal verb ( see also ↑ round )
1 . if police or soldiers round up a particular group of people, they find them and force them to go to prison:
Thousands of men were rounded up and jailed.
2 . to find and gather together a group of people, animals, or things:
See if you can round up a few friends to help you!
His dog Nell started to round up the sheep.
3 . to increase an exact figure to the next highest whole number ⇨ round down