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've had worse. You can call me Sam... if you want. - My mother calls me Sam. - It's not going to get any easier, you know? - You're going to have to defend yourself. - Why didn't you get up and fight? I wanted to. - I just couldn't. - Why not? I'm a coward. (..)2011 TvShow: Game of Thrones Title: Cripples, Bastards, and Broken Things Season: 1 Episode 4
(..) - I yield! - Enough! - He yielded. Looks like the bastard's in love. All right then, Lord Snow, you wish to defend your lady love, let's make it an exercise. You two. Three of you ought to be sufficient to make lady piggy squeal. All you've got to do is (..)2011 TvShow: Game of Thrones Title: Cripples, Bastards, and Broken Things Season: 1 Episode 4