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]
(..) so rashly. Where does my allegiance lie if not here? This is the city of the Men of Númenor. I will gladly give my life to defend her beauty... ...her memory, her wisdom. Your father loves you, Faramir. He will remember it before the end. Can you sing, Master Hobbit? (..)2003 The Lord of the Rings: The Return of the King
(..) Bless my bark! Peregrin Took! I'll take that, my lad. Quickly, now. Tonight we remember those who gave their blood to defend this country. Hail the victorious dead. Hail! No pauses. - No spills. - And no regurgitation. (..)2003 The Lord of the Rings: The Return of the King