Secure: To make fast; safe; the completion of a drill or exercise on board ship.
Seize: To bind with small rope.
Semaphore: Flag signaling with the arms.
Set the course: To give the steersman the desired course to be steered.
Set up rigging: To take in the slack and secure the standing rigging.
Settle: To lower, sink deeper.
Shackle: A U-shaped piece of iron or steel with eyes in the end closed by a shackle pin.
Shaft alley: Covered tunnels within a ship through which the tail shafts pass.
Shake a leg: An order to make haste.
Shakedown cruise: A cruise of a new ship for the purpose of testing out all machinery, etc. Shank: The main piece of the anchor having the arms at the bottom and the Jew’s harp at the top.
Shanghaied: The practice of obtaining a crew by means of force. Crews were hard to get for long voyages, and when the unwilling shipmate regained consciousness, he found himself bound for some remote port, such as Shanghai. One who is forced to do something against his will.
Shape a course: To ascertain the proper course to be steered to make the desired point or port. Shark’s mouth: The opening in an awning around the mast.
Sheave: The wheel of the block over which the fall of the block is rove.
Sheer: A sudden change. The longitudinal dip of the vessel’s main deck.
Sheet: The rope used to spread the clew of head sails and to control the boom of boom sails.
Shell: The casing of a block within which the sheave revolves.
Ship: To enlist; to send on board cargo; to put in place; to take on board.
Ships time: Ships time was counted by the half hour, starting at midnight. A half hour after twelve was one bell; one o’clock, two bells; and so on until four o’clock, which was eight bells. The counting then started over again, with 4:30 being one bell.
Short stay: When the scope of chain is slightly greater than the depth of water.
Shorthanded: Without sufficient crew.
Shot: A short length of chain, usually 15 fathoms (90 feet). (Method of measuring chain.)
Shove in your oar: To break into a conversation.
Shrouds: Side stays from the masthead to the rail..
Side lights: The red and green running lights, carried on the port and starboard sides respectively, of vessels under-way.
Sing out: To call out.
Sister hooks: Two iron flatsided hooks reversed to one another.
Skids: Beams sometimes fitted over the decks for the stowage of heavy boats or cargo.
Skipper: The captain.
Sky pilot: A chaplain.
Skylight: A covering, either permanent or removable, to admit air and light below decks.
Slack: The part of a rope hanging loose; the opposite of taut.
Slack water: The condition of the tide when there is no horizontal motion.
Slip: To let go by unshackling, as a cable.
Slop chest: Stock of merchandise, such as clothing, tobacco, etc., maintained aboard merchant ships for sale to the crew
Slush: White-lead and tallow used on standing rigging.
Smart: Snappy, seamanlike; a smart ship is an efficient one.
Smothering lines: Pipe lines to a compartment for smothering a fire by steam or by a chemical.
Snatch: block: A single block fitted so that the shell or hook hinges to permit the bight of a rope to be passed through.
Snub: To check suddenly.
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