n. Nautical: A spar rigged out from a ship's top or crosstrees, to spread the breast-backstays.n. Any boom rigged out from a ship's side to hang boats by.n. A heavy spar or strong beam of wood placed across a ship's deck, lashed securely to both sides of the ship, and having tackles from its projecting ends to the masthead, to assist in securing the mast while the ship is hove down.n. Any spar thrust out to help to give a lead to a purchase or to extend a sail.n. An iron bracket fixed to the outside of a boat and carrying a rowlock at its extremity, designed to increase the leverage of the oar.n. Hence A light boat provided with such apparatus.n. A frame rigged out from the side of canoes in the islands of the Indian and Pacific oceans, to form a counterpoise and prevent the boat from upsetting.n. In machinery: A pulley or wheel extended outside of the general frame of a machine.n. The jib of a crane, or a joist projecting from a building to support a hoisting-tackle.n. See the quotation.n. A frame used on a farm wagon, to enable it to carry larger loads, as of hay.