Pronunciation: (bool'wurk, -wôrk, bul'-),[key] —n. 1. a wall of earth or other material built for defense; rampart.
2. any protection against external danger, injury, or annoyance: The new dam was a bulwark against future floods. 3. any person or thing giving strong support or encouragement in time of need, danger, or doubt: Religion was his bulwark. 4. Usually, bulwarks.Naut.a solid wall enclosing the perimeter of a weather or main deck for the protection of persons or objects on deck.
—v.t. to fortify or protect with a bulwark; secure by or as if by a fortification.