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/ʌnˈfɛtɚ/ · verb
(transitive) To release from fetters; to unchain; to let loose; to free..
He saw the same Turnkey unfetter a man / With but little expedition
Use unfetter when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Unfetter means (transitive) To release from fetters; to unchain; to let loose; to free..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
He saw the same Turnkey unfetter a man / With but little expedition
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