In a square-rigged vessel, the sail next above the lowermost sail on a mast. This sail is the one most frequently reefed or furled in working the ship. In a fore-and-aft rigged vessel, the sail set upon and above the gaff. See Cutter, Schooner, Sail, and Ship.
- A square sail set above the lowest sail on the mast of a square-rigged ship.
- A triangular or square sail set above the gaff of a lower sail on a fore-and-aft-rigged ship.