Safeguard /(?)/

Safe·guard

Safeguard

n.
  1. One who, or that which, defends or protects; defense; protection.
    Thy sword, the safeguard of thy brother's throne.
    — Granville.
  2. A convoy or guard to protect a traveler or property.
  3. A pass; a passport; a safe-conduct.

Safeguard

v. t.
  1. To guard; to protect.