Definitions for safety lock
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Princeton's WordNet
safety catch, safety lock(noun)
guard consisting of a locking device that prevents a weapon from being fired
safety bolt, safety lock(noun)
a bolt that cannot be moved from outside the door or gate
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"safety lock." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/safety lock>.