Significados de unchained lion en inglés

The players of the harpsichord were ignorant of muscular effects; there was nothing of the unchained lion about them.

Softly she touched him upon the arm; and, like an unchained lion, he sprang up and stared her in the face.

Do not a thousand examples prove that they ought to fear that these unchained lions, after having devoured nations, will in turn devour them?