Meaning

• A defensive wall or rampart.

• A defense or safeguard.

• A breakwater.

• 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.

• Any means of defence or security.

Meaning

• To fortify something with a wall or rampart.

• To provide protection of defense for something.