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The lowest deck of a ship, especially a warship, having at least four decks.
(Nautical Terms) nautical (in a vessel with four or more decks) the lowest deck
[C15: from Dutch overloopen to run over, spill. See over, leap]
(in a ship) the lowermost of four or more decks above the space at the bottom of a hull. Also called or′lop deck`.
[1375–1425; late Middle English overloppe < Middle Dutch over-loop covering]