镣铐
chains tied around someone to prevent them from escaping or moving
It was common practice for the prisoners to be clapped in irons (= tied with chains). 通常会用镣铐铐住犯人。
He was kept in irons and frequently deprived of food.
Several of the sailors were put in irons for insubordination.
His hands were tied behind his back and his legs placed in irons.
They spent several months in irons.
See also: iron noun (CHAINS)