Shackle
Part of speech: noun
Definition: A restraint fit over a human or animal appendage, such as a wrist, ankle or finger. Usually used in plural, to indicate a pair joined by a chain. A U-shaped piece of metal secured with a pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. Sometimes referred to as a D shackle, a D closure or a green pin shackle.
Part of speech: verb
Definition: To restrain using shackles; to place in shackles. By extension, to render immobile or incapable; to inhibit the progress or abilities of someone or something.
Clevis
Part of speech: noun
Definition: A U-shaped coupling having holes at each end, through which a bolt is run; used especially to fit attachments to a tractor or other vehicle as it allows a degree of rotation about the bolt.