round in

verb2

1. •
   To haul up; usually, to haul the slack of (a rope) through its leading block, or to haul up (a tackle which hangs loose) by its fall.

   • Moncrieff rounded in the slack of the rope and landed the captain most beautifully. — 1891
2. •
   (US, old-fashioned) To round up (cattle) by riding around them.