To spring to one's seat upon a horse, into the saddle. Often with up. Also, †to leap on, †to leap to horse.

intransitive. With on, upon. To mount a horse. Obsolete.

intransitive. To leap, jump; to caper, cavort; (also) to leap or spring upon a horse. Also figurative. Obsolete.

= vault, v.2 2. Obsolete. rare.

intransitive. To spring or leap; spec. to leap with the assistance of the hand resting on the thing to be surmounted, or with the aid of a pole.