meaning of shackle
1. Stubble.
2. Something which confines the legs or arms so as to prevent their free motion; specifically, a ring or band inclosing the ankle or wrist, and fastened to a similar shackle on the other leg or arm, or to something else, by a chain or a strap; a gyve; a fetter.
3. Hence, that which checks or prevents free action.
4. A fetterlike band worn as an ornament.
5. A link or loop, as in a chain, fitted with a movable bolt, so that the parts can be separated, or the loop removed; a clevis.
6. A link for connecting railroad cars; -- called also drawlink, draglink, etc.
7. The hinged and curved bar of a padlock, by which it is hung to the staple.
8. To tie or confine the limbs of, so as to prevent free motion; to bind with shackles; to fetter; to chain.
9. Figuratively: To bind or confine so as to prevent or embarrass action; to impede; to cumber.
10. To join by a link or chain, as railroad cars.
11. a restraint that confines or restricts freedom especially something used to tie down or restrain a prisoner