safety catch

a device used in mechanisms, as for elevators, to prevent falling in the event of mechanical failure.
safety ( def 4 ).

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
safety catch
a device to prevent the accidental operation of a mechanism, e.g. in a firearm or lift

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Calmly he aimed his rifle at the congregation, switched the safety catch to
  automatic fire, and pulled the trigger.
Plug the electrical cord into the trailer and fasten the safety catch.
The tank lids must lock open with a positive safety catch.
If not available, improvise by inserting a screwdriver into the well and
  depressing the safety catch.
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