Safeguard

[Jessica]

One who, or that which, defends or protects; defense;
protection.

[Couch Potatoe]

Used to confirm your telling the truth and not having a friend on. Onboard Warships a fire would be prefixed with safeguard, safeguard, safeguard, to allow the ships company to know its not an exercise.

[Raeanne Dimick]

(verb); to protect; to shield; to routinely check up; to care for; to defend; to guard
[protect], [shield], [defend], [guard]

[Merna]

A measure taken to protect someone or something or to prevent something undesirable.