كَبِدًا literally means “a liver.” جَائِعًا is its adjective, “hungry.” The complete expression كَبِدًا جَائِعًا refers figuratively to a hungry living being, not to feeding an isolated organ.
This Arabic expression names a bodily part to evoke the whole creature. With أَنْ تُشْبِعَ, it directs attention to the practical act of relieving hunger.
Examples include providing appropriate food to a hungry traveler or to an animal in need of suitable nourishment.