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n (nautical) A spar formerly used on board of ships, as a crane to hoist the flukes of the anchor to the top of the bow, without injuring the sides of the ship.

n (context|nautical|construction) a crane, often working in pairs and usually made of steel, used to lower things over an edge of a long drop off, such as lowering a maintenance trapeze down a building or launching a lifeboat over the side of a ship.