A defense or safeguard.
A defensive wall or rampart.
A breakwater.
Any means of defence or security.
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.
To fortify something with a wall or rampart.
To provide protection of defense for something.
A stronghold or fortified place.
An armoured portion of a warship, housing important equipment.
A Salvation Army meeting place.
A strong fortress that sits high above a city.