n 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 hobble.
n 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.
v By extension, to render immobile or incapable; to inhibit the progress or abilities of someone or something.