A rampart; a fortification; a bastion or outwork.
- A wall or embankment raised as a defensive fortification; a rampart.
- Something serving as a defense or safeguard: "We have seen the necessity of the Union, as our bulwark against foreign danger” ( James Madison).
- A breakwater.
- The part of a ship's side that is above the upper deck. Often used in the plural.
- To fortify with a wall, embankment, or rampart.
- To provide defense or protection for.