Single-Day Tide. Tide going through its cycle once in a tidal day. More usually called a 'diurnal' tide.
Single-Deck Type. Name given to vessels having no deck below upper deck.
Single-Plate Centre Keelson. Vertical plate going fore and aft, on top of floors and riveted to a lug and reverse bar at each floor.
Single Whip. Rope rove through a standing block for hoisting purposes.
Singling Up. Taking in all ropes not wanted, so that only a minimum number of ropes will require casting off when leaving a berth or buoy.
Sink. To become submerged. To move downwards. To go down to bottom of the sea. To go below the horizon.
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