Final answer:
The term 'Fail Safe' in locks implies a locking mechanism that automatically unlocks during a power outage or emergency to permit free egress.
Step-by-step explanation:
In the context of locks, "Fail Safe" refers to a security feature that ensures a locking device will default to an unlocked state during a power failure or when a fire alarm is activated. This is to guarantee an unobstructed exit in the case of an emergency. A fail-safe lock is often compared to a "break glass in case of emergency" safeguard due to its function of providing security under normal circumstances while allowing immediate egress when required.