a cage

Aragorn: "You have some skill with a blade."

Eowyn: "Women of this country learned long ago - those without swords can still die upon them. I fear neither death nor pain."

Aragorn: "What do you fear, my lady?"

Eowyn: "A cage."

Eowyn: "To stay behind bars until use and old age accept them. And all chance of valor has gone beyond recall or desire."