When an object changes direction after hitting something, or the cause to deviate from an intended purpose.
See examples Tiffany and Rowen Flanigan:
After surviving the biggest sex scandal to rock major league soccer, the Flanigans are finally living the dream. They're newlyweds, have great friends, and are both making names for themselves in their respective careers. They have goals for their future and big plans on how to make it all happen.
But when a new and unexpected development suddenly arises, Tiffany and Rowen realize all those carefully made plans are about to become irrelevant. Things will never be the same when their lives are deflected.