One who fetters or restrains; a person who puts chains on prisoners or enslaves others; figuratively, something that restricts or limits.
Agent noun from 'fetter' (from Old English feter) plus '-er' (denoting one who does an action). Created in English to identify the active restrainer.
A 'fetterer' is the person applying the chains—morally loaded language that identifies the perpetrator of restraint, making it not just a passive restriction but an active harmful choice by someone.
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