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The Collaborative International Dictionary
Jackstay

Jackstay \Jack"stay`\, n. (Naut.) A rail of wood or iron stretching along a yard of a vessel, to which the sails are fastened.

Wiktionary
jackstay

n. 1 (context nautical English) A stay (rope, bar or batten), running along a ship's yard, to which is attached the head of a square sail. 2 (context nautical English) A cable between two ships or from a ship to a fixed point which can be used to support a load during transfer of personnel or materiel along the cable. 3 (context nautical English) A line (rope, webbing or cable), attached to a boat at the ends, to which a safety harness can be clipped to restrain falling in rough conditions and to prevent falling overboard. 4 (context underwater diving English) A line fixed at both ends, which may be used to guide a load or a diver along the route of the line. Uses include guidance to and from the underwater work site, and as a means of controlling an underwater search.

Usage examples of "jackstay".

Denny got into the harness, clipped onto a jackstay, and worked his way forward.

I had traced out bit by bit, until now I could clearly see the jackstay, running along the top of the royal mast.

Slowly the sagging jackstay tautened, the men slowing down with the effort as the strain came on the anchor cables.