safety-catch

safety catch

noun
1.
a device used in mechanisms, as for elevators, to prevent falling in the event of mechanical failure.
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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World English Dictionary
safety catch
 
n
a device to prevent the accidental operation of a mechanism, e.g. in a firearm or lift

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