Safeguard
Safeguard , noun
[Safe = guard: compare French sauvegarde.]
1.
One who, or that which, defends or protects; defense; protection. — Shakespeare
Thy sword, the safeguard of thy brother's throne.
2.
A convoy or guard to protect a traveler or property.
3.
A pass; a passport; a safe-conduct. — Shakespeare
Safeguard , transitive verb
To guard; to protect. — Shakespeare