Dance the hempen jig - To hang

Davy Jones' Locker - A fictional place at the bottom of the ocean, meaning death. It was said that Davy Jones were to sink every ship he ever took over, and thus, the watery grave that awaited, all who were sunk by him was given his name. To die at sea is to go to Davy Jones' Locker (NOOB)

Deadlights - Strong shutters or plates fastened over a ship's porthole or cabin window in stormy weather/Thick windows set in a ship's side or deck/Eyes (Noob)

Dead Men Tell No Tales - Standard pirate excuse for leaving no survivors (Noob)

Doubloon - A Spanish gold coin (NOOB)

Draft - The depth of a ship's keel below the water line, especially when loaded; the minimum water depth necessary to float a ship (Master)

Draught/Draft - The amount taken in by a single act of drinking, the drawing of a liquid as from a cask or keg (Intermediate)