bulwark🔊

A defensive wall or rampart.

A defense or safeguard.

A breakwater.

(nautical) The planking or plating along the sides of a nautical vessel above her gunwale that reduces the likelihood of seas washing over the gunwales and people being washed overboard.

(figurative) Any means of defense or security.

To fortify something with a wall or rampart.

To provide protection of defense for something.