guard lock

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guard lock

[′gärd ‚läk]
(civil engineering)
(engineering)
An auxiliary lock that must be opened before the key can be turned in a main lock.
References in periodicals archive ?
Carefully reduce the height of these surfaces until the trigger guard locks with firm hand pressure.
It has duel trigger guard locks to help deter gun grabs, yet it allows for rapid draw.
INVITES ONLY: A security guard locks the gates of Stormont.
The clear safety guard locks temporarily, protecting healthcare workers while transporting the syringe to the patient location.
A security guard locks up for the last time at the Dome last night
The Insta Guard locks are rubber lined to protect the firearms.