shackle

nouns

a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)

a U-shaped bar; the open end can be passed through chain links and closed with a bar

shackle

is a part of

a detachable lock; has a hinged shackle that can be passed through the staple of a hasp or the links in a chain and then snapped shut

is a type of (narrower)

a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon

"there were bars in the windows to prevent escape"

bind the arms of

pinion, shackle

restrain with fetters

fetter, shackle