safety hook

noun
a hook that can be transformed into an eye by locking a hinged piece in place.

Origin:
1870–75

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The dynamometer would be attached to the hook line either by means of a safety hook or adequately sized screw-pin shackle.
Proposed amendments will require that a safety hook or shackle be used on the upper block.
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