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]
(..) we will stand and fight... ...and die. A new age has begun. An age of freedom. And all will know that Spartans... ...gave their last breath to defend it. My friend. I have lived my entire life without regret until now. It's not that my son gave up his life for his country. (..)2006 300
(..) any of my own men for victory. And I would die for any one of mine. You Greeks take pride in your logic. I suggest you employ it. Consider the beautiful land you so vigorously defend. Picture it reduced to ash at my whim. Consider the fate of your women. Clearly you don't know our women. (..)2006 300