Guard lock

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

See also: Guard

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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BOC-Naia district collector Carmelita Talusan said that 20 rifle hand guards and six hand guard locks were found inside a package from Shanghai, China.
The east and west guard locks originally were built to allow for navigation across the Genesee River during the navigation season in a wide range of elevations without affecting water levels in the canal to the west and east of the river.
The range includes key switch interlocks, key exchange units, access guard locks, timer delay units and solenoid control devices.
The barrel's integral gas block dovetails around the front end of the slide, and a rotating lever located in the frame just above the front of the trigger guard locks the rear of the barrel solidly into place in a mortise inside the frame.
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