safety-lock

safety lock

noun
1.
a lock designed to prevent picking.
2.
safety ( def 4 ).

Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
safety lock

noun
1. guard consisting of a locking device that prevents a weapon from being fired [syn: safety catch
2. a bolt that cannot be moved from outside the door or gate [syn: safety bolt
WordNet® 3.0, © 2006 by Princeton University.
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