A wooden warship made lower by the removal of the upper deck.
To remove the upper deck of (a warship)
(nautical) To cut (a ship) down to a smaller number of decks, and thus to an inferior rate or class.
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.