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]
(..) are engaged with the enemy. ROLAND: I know. And I have made every effort to make sure that, if the Duke should fail, Paris will still be well defended. Your Highness should be assured that you are not completely dependent on a Northman. I rather like being dependent on a Northman. (..)2016 TvShow: Vikings Title: The Last Ship Season: 4 Episode 10
(..) I will never marry and I will never father children. Brother Loras... ...I ask you to dedicate your life to the seven gods. Will you fight to defend your faith against heretics and apostates? I will. No, I can't let them... Faith is the way, Father. All right. (..)2016 TvShow: Game of Thrones Title: The Winds of Winter Season: 6 Episode 10
(..) Dialogue: ..,Default,,,Hmm, she represented felons. Dialogue: ..,Default,,,That's going to be\Na long list of suspects. Dialogue: ..,Default,,,She defended those who lacked\Nthe means to defend themselves. Dialogue: ..,Default,,,Drea told me once\Nthat she thought (..)2016 TvShow: Bones Title: The Death in the Defense Season: 11 Episode 11