When you redirect something, you point it in a different direction. If your dog keeps licking your friends' knees, you might have to redirect her attention to a squeaky toy.
Beavers can famously redirect the flow of water in a stream or river by building dams that divert the flow in a new direction. The very best elementary school teachers are experts at redirecting the attention of young kids, like when a music teacher redirects a class's energy into an enthusiastic round of "Row, Row, Row Your Boat." The direct part of redirect comes from the Latin dirigere, "set straight."