From Longman Dictionary of Contemporary Englishleg ironsˈleg irons noun [plural] SCmetal chains that are put around a prisoner’s legs → manacle
Examples from the Corpus
leg irons• Prohibited items should include gallows and leg irons.• There they had spent fourteen days in solitary confinement, chained in heavy leg irons and fed only on dry rice.• From now on, these items will be included in the existing export ban of leg irons, shackles and gang chains.• Only the eerie tinkle of leg irons and shouted commands break the silence.• The leg irons of the white prisoners inside were clattering. 