stand up for

stand up for или  {informal} stick up for  {v.}

Вступаться (за) или постоять за, отстаивать (кого-л., что-л.); бороться за.

John always stands up for his rights.

When Mary was being criticized, Jane stuck up for her.

Ср.:

BACK UP,

GO TO BAT FOR,

STAND BY,

STAND ONE'S GROUND,

STICK TO ONE'S GUNS,

GO TO BAT FOR.