What is the meaning of Shackle?

A restraint fit over a human or animal appendage, such as a wrist, ankle or finger; normally used in pairs 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.

A restraint on one's action, activity, or progress.

A fetter-like band worn as an ornament.

A link for connecting railroad cars; a drawlink or draglink.

A length of cable or chain equal to 12+2 fathoms or 75 feet, or later to 15 fathoms.

To restrain using shackles; to place in shackles.

To render immobile or incapable; to inhibit the progress or abilities of.

To shake, rattle.

shackle, fetter, manacle

wrist

to shackle

Source: wiktionary.org