When Helen criticized me, Chris came/rushed to my defense.
She argued strongly in defense of her actions.
A good diet helps build the body's natural defenses.
I exploded and made quite a speech in defense of reading. (First Certificate in English; B2; Portugese)
I'm best playing defense.
They said that I'm good at defense and they want that I be in reserve [for] the competition. (Preliminary English Test; B1; Chinese)
Spending on defense / Defense spending is increasing.
the defense industry
The majority of the government's expenditure went to other things apart from defense, education and health. (International English Language Testing System; C1; English)
He was cross-examined by the defense.
a lawyer for the defense / a defense lawyer
He tried to explain that the counsel for the defen[s]e was one of the best old hands in the country but they did not [even] pretend to listen to him. (Certificate of Proficiency in English; C2; Polish)