Serve—To wind cord or canvas round a rope or spar to protect it from chafing.
Seize—To make fast by taking a number of turns with small line.
Sheer—To sheer is to move away from the proper course. The sheer of a vessel is the fore-and-aft curve of the deck line.
Ship—To ship is to take on board.
Shiver—To shake the canvas by bringing the luff in the wind.
Slack—The part of a rope that hangs loose.
Slip—To slip is to let go of a cable without taking it on board.
Snub—To check the cable when running out.
Sound—To try the depth of water by casting the lead.