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.
Someone who guards, watches over, or protects.
A superior in a Franciscan monastery.
A person legally responsible for a minor (in loco parentis).
A person legally responsible for an incompetent person.
A major or final enemy; boss.