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]
(..) I come before you to confess my treason... in the sight of gods and men. I betrayed the faith of my king... and the trust of my friend Robert. I swore to protect and defend his children. But before his blood was cold... I plotted to murder his son... and seize the throne for myself. (..)2011 TvShow: Game of Thrones Title: Baelor Season: 1 Episode 9