Emily Dickinson Lexicon

SHACK'LE, or SHACK'LES, n. [generally used in the plural.]

1. Fetters, gyves, handcuffs, cords or something else that confines the limbs so as to restrain the use of them, or prevent free motion. – Dryden.
2. That which obstructs or embarrasses free action. His very will seems to be in bonds and shackles. – South.