swivel

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swivel

1. a coupling device which allows an attached object to turn freely
2. such a device made of two parts which turn independently, such as a compound link of a chain

swivel

[′swiv·əl]
(design engineering)
A part that oscillates freely on a headed bolt or pin.
(petroleum engineering)
A short piece of casing having one end belled over a heavy ring, and having a large hole through both walls, the other end being threaded.