Spitfire jib—The smallest storm jib.
Taunt—Tall, high.
Taut—Tight.
Tie up—A lubber's synonym for moor. You tie up a dog. You moor a vessel.
Thimble—A heart shaped or circular ring with a groove outside for ropes to fit in. They are used for the eye splices in ropes, the straps of blocks and for the cringles in sails.
Thwarts—The transverse seats in boats.
Tumble home—When the sides of a vessel near the deck incline inward the opposite to flaring.
Tyers—Ropes that secure a mainsail when stowed.
Unbend—To cast loose a sail from stay, gaff, boom or yard.
Veer—To pay out chain.