shackle
     n 1: a restraint that confines or restricts freedom (especially
          something used to tie down or restrain a prisoner) [syn:
           {bond}, {hamper}, {trammel}, {trammels}]
     2: a U-shaped bar; the open end can be passed through chain
        links and closed with a bar
     v 1: bind the arms of [syn: {pinion}]
     2: restrain with fetters [syn: {fetter}]
Source: WordNet® 2.0