safety chain

noun

Definition of safety chain 

1a : a normally slack chain for preventing excessive movement between a railroad car truck and a car body in sluing

b : a heavy chain by which railroad cars may be connected to protect against accidental uncoupling

2 : a small chain used as a secondary safeguard on a piece of jewelry (as a watch or bracelet)

3 : a chain formed of sheet metal links with an elongated hole through each broad end and constructed by a repeated series of doubling a link upon itself, slipping the next link through the two now superimposed holes of the first, and doubling it

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First Known Use of safety chain

1822, in the meaning defined at sense 2

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The first known use of safety chain was in 1822

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