To sweep (as a yard with a broom [-an]); to scratch (as a chicken looking for food); to sweep (as when looking for s.t. or when sweeping trash or dirt to a certain location [-un].
The -un imp. is used for sweeping dirt aside to find s.t. The -an imp. is used for sweeping s.t. to make it look better.
I'm going to sweep our yard first before we go.
Put a fence around your eggplant so it won't get ruined by a chicken scratching it.
Sweep that trash over to that coconut tree.