- a lock designed to prevent picking.
- safety(def 4).
Origin of safety lock
First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for safety lock
When the firing is stopped be sure to turn on the safety-lock.Manual of Military Training
James A. Moss
It had to be slid sideways for a quarter of an inch, a safety-lock feature.The Blue Ghost Mystery
Harold Leland Goodwin
The bore is made of any rifle calibre for any small-arm ammunition, and is fitted with a safety-lock.The Romance of Modern Invention
Some one, a woman I believe, has correctly defined it as "the safety-lock upon the property of the people."Sophisms of the Protectionists
To bribe the guard was foolhardy because the guard did not know the combination of the safety-lock.The Unpublishable Memoirs
A. S. W. Rosenbach