DECOY. So to change the aspect of a ship-of-war by striking a topgallant-mast, setting ragged sails, disfiguring the sides by whitewash or gunpowder, yellow, &c., as to induce a vessel of inferior force to chase; when, getting within gun-shot range, she becomes an easy capture. Similar manœuvres are sometimes used by a single ship to induce an enemy's squadron to follow her into the view of her own fleet. DEEP. A word figuratively applied to the ocean. On the coast of Germany, to the northward of Friesland, it is of the same import as gulf on the coasts of France, Spain, Italy, &c. Also, any depth over 20 fathoms.--_Deep-sea fishing._ In contradistinction to coast, or when the hand-lead reaches bottom at 20 fathoms.--_Hand deeps._ Out of ordinary leadsman's sounding.--A vessel is deep as regards her lading, and is also said to sail deep when her expenses run high. DEEPENING. Running from shoal water by the lead. DEEP-SEA LINE. Usually a strong and water-laid line. It is used with a lead of 28 lbs., and adapted to find bottom in 200 fathoms or more. It is marked by knots every ten fathoms, and by a small knot every five. The marks are now nearly superseded by Massey's patent sounding-machine.--_Marks and Deeps_, &c., _see_ LEAD and LINE. DEEP-WAIST. That part of the open skids between the main and fore drifts in men-of-war. It also relates to the remaining part of a ship's deck, when the quarter-deck and forecastle are much elevated above the level of the main-deck, so as to leave a vacant space, called the waist, on the middle of the upper deck, as in many packets. DEESE. An east-country term for a place where herrings are dried. DEFAULTER'S BOOK. Where men's offences are registered against them, and may be magnified without appeal. DEFECTS. An official return of the state of a ship as to what is required for her hull and equipment, and what repairs she stands in need of. Upon this return a ship is ordered to sea, into harbour, into dock, or paid out of commission. DEFICIENCY. What is wanting of a ship's cargo at the time of delivery. DEFILADE. In fortification, is the art of so disposing defensive works, _on irregular or commanded sites_, that the troops within them shall be covered from the direct fire of the enemy. DEFILE. A narrow pass between two heights, which obliges a force marching through to narrow its front. This may prove disastrous if attacked, on account of the difficulty of receiving aid from the rear. DEFILING. Filing off, marching past. DEFINITIVE. Conclusive; decisive.