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 ?
INVITES ONLY: A security guard locks the gates of Stormont.
A security guard locks up for the last time at the Dome last night
The guard locks into position with a solid click and substantially eliminates the risk of an accidental needlestick.