bulwark (noun)
1: an embankment built around a space for defensive purposes; "they stormed the ramparts of the city"; "they blew the trumpet and the walls came tumbling down" [syn: rampart, wall]
2: a fence-like structure around a deck [syn: bulwarks]
3: a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away [syn: breakwater, groin, groyne, mole, seawall, jetty] v : defend with a bulwark