vbl. sb. Shipbuilding. [Of obscure origin: cf. SNY sb., and dial. sny, snigh to turn up the nose.] (See quots.)
1711. W. Sutherland, Ship-build. Assist., 47. As much as possible keep your Work from extream Snying or Cambering. Ibid., 164. Snying, an arching upwards, where the Middle of the Plank appears higher than the Ends.
1815. Burney, Falconers Mar. Dict., 488/1. Snying, among shipwrights, a term used for a circular plank, edgeways, to work in the bows of the ship.
So Snying ppl. a., having an upward curve or sny.
1711. W. Sutherland, Ship-build. Assist., 47. You will likewise be obliged to have snying (or crooked) Planks.
1736. Pegge, Kenticisms (E. D. S.), 48. A stick or bat of timber is said to be a snying piece, when it bends or is somewhat curved.
c. 1850. Rudim. Navig. (Weale), 149. Snying. A term applied to planks when their edges round or curve upwards. Ibid., 152. Its use is to take out the snying edge.