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]
(..) But we still need to fight him. That's all I know. You and I won't find much joy while we're here. But we can keep up the life. We can defend those who can't defend themselves. I am the shield that guards the realm of men. Maybe we don't need to understand anymore than that. (..)2017 TvShow: Game of Thrones Title: Beyond the Wall Season: 7 Episode 6