Both Uses of

fetter
in
Utopia, by Thomas More

Of the same metals they likewise make chains and fetters for their slaves, to some of which, as a badge of infamy, they hang an earring of gold, and make others wear a chain or a coronet of the same metal; and thus they take care by all possible means to render gold and silver of no esteem; and from hence it is that while other nations part with their gold and silver as unwillingly as if one tore out their bowels, those of Utopia would look on their giving in all they possess of those metals (when there were any use for them) but as the parting with a trifle, or as we would esteem the loss of a penny!†
*

fetters = restrains or hinders OR shackles for the ankles

But after the ambassadors had stayed a day among them, and saw so vast a quantity of gold in their houses (which was as much despised by them as it was esteemed in other nations), and beheld more gold and silver in the chains and fetters of one slave than all their ornaments amounted to, their plumes fell, and they were ashamed of all that glory for which they had formed valued themselves, and accordingly laid it aside—a resolution that they immediately took when, on their engaging in some free discourse with the Utopians, they discovered their sense of such things and their other customs.†

Definition:

to restrain or hinder

or more archaically:

a shackle for the ankles