The team is looking to 'defend' its national title. [=to win the national title again]
As a U.S. senator, it is my responsibility to 'defend' [='uphold'] the Constitution.
She successfully 'defended' her championship. [=she won the championship again]
(..) pluck out our eyes, leave us cowering behind the Wall hoping for the storm to pass? We can't defend the gate against men. This castle has stood for thousands of years. The Night's Watch has defended her for thousands of years. (..)2014 TvShow: Game of Thrones Title: Mockingbird Season: 4 Episode 7