Synonyms for Shackle (same or very similar meaning)
WordNet sense 1 (a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)):
bond, hamper, trammelWordNet sense 2 (bind the arms of):
pinion, pinionWordNet sense 3 (restrain with fetters):
fetterFrom the ODE community, based on WordNetadd/edit