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.
Security; guaranty; bail.
A formal warning given as an alternative to prosecution in minor cases.
A yellow card.
Prudence when faced with, or when expecting to face, danger; care taken in order to avoid risk or harm.
A careful attention to the probable effects of an act, in order that failure or harm may be avoided.
To warn; to alert, advise that caution is warranted.
To give a yellow card