One who puts fetters (shackles) on; to chain or restrain with fetters; or something that binds or restricts.
From 'be-' + 'fetter' (from Old English 'feter,' a chain for the feet, from Proto-Germanic 'fotri'). The verb means to put fetters on, and the noun refers to whoever or whatever does the restraining.
Studying words like 'befetter' reveals how medieval English had rich vocabulary for describing oppression and control—the language was built with precision to describe social hierarchies and the literal chains that enforced them.
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