An arched overhead covering, such as the sky, that resembles the architectural structure in form, A burial chamber, especially when underground, a partly glazed plate inserted in a pavement or ceiling to admit light to a vault below, intransitive verb_ To leap; to bound; to jump; to spring, To exhibit feats of tumbling or leaping; to tumble, transitive verb_ To form with a vault, or to cover with a vault; to give the shape of an arch to; to arch, To leap over; esp., to leap over by aid of the hands or a pole