If you're in a defensive crouch about the problem, you can't cure it.
Instinctively they both dropped to a defensive crouch to survey the area.
He dropped into a defensive crouch, the knife held defensively before him.
She dropped into a defensive crouch when someone stepped out in front of her.
You get into a little bit of a defensive crouch.
He dropped into a defensive crouch and circled behind a rock.
The business at hand dropped into a defensive crouch.
He dropped into a defensive crouch, and began a slow circling around the other man.
In a moment she was in a defensive crouch, ready to spring.
Then he fell into a defensive crouch, looking to see what damage he'd done.