Definitions
1.nounA defensive wall or rampart.
2.nounA defense or safeguard.
3.nounA breakwater.
4.nounThe 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.
5.nounAny means of defence or security.
6.verbTo fortify something with a wall or rampart.
7.verbTo provide protection of defense for something.