safety lock

safety lock

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

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Safety lock is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
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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