noun the sides of a ship above the upper deck.
2. bulwark ·noun a rampart; a fortification; a bastion or outwork.
3. bulwark ·noun that which secures against an enemy, or defends from attack; any means of defense or protection.
4. bulwark ·vt to fortify with, or as with, a rampart or wall; to secure by fortification; to protect.