Guard lock

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(Engin.) a tide lock at the mouth of a dock or basin.

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The inspection work includes, but is not limited to the following structures; locks, dams, guard gates, guard locks, retaining walls, culverts and spillways.
In prison the guard locks and unlocks all the doors for you, but at work you must often carry a security card and open all the doors for yourself.
CLOSING: A security guard locks the factory gates, right; and above, the BPI factory in Stockton Picture by IAN COOPER