safeguard

Short definition from Wiktionary

Noun

1. 1
   Something that serves as a guard or protection; a defense.
2. 2
   One who, or that which, defends or protects; defence; protection.
3. 3
   A safe-conduct or passport, especially in time of war.
4. 4
   The monitor lizard.

Verb

1. 1
   To protect, to keep safe.
2. 2
   To implement safeguarding.
3. 3
   To escort safely.