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safety chain

British  

noun

  1. Also called: guard.  a chain on the fastening of a bracelet, watch, etc, to ensure that it cannot open enough to fall off accidentally

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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For the John S. McCain to collide with the Alnic MC, a handful of separate functions in the safety chain must have failed, the officer said.

From New York Times • Aug. 21, 2017

He walked through the doorway at the front of the car, unhooked the safety chain, and jumped down onto the tracks, disappearing into the dark of the tunnel.

From "The Tipping Point" by Malcolm Gladwell