noun

a series of linked metal rings used for fastening or securing something, or for pulling loads.

he slid the bolts on the front door and put the safety chain across

fetters,shackles,bonds,irons,leg irons,manacles,handcuffs,cuffs,bracelets,trammels,gyves,darbies,bilboes

verb

fasten or secure with a chain.

she chained her bicycle to the railings

tie,secure,fasten,tether,hitch,bind,rope,moor,restrain,shackle,fetter,manacle,handcuff,hobble,confine,imprison,trammel,gyve