Etymology
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unfasten (v.)

early 13c., from un- (2) "opposite of" + fasten. Old English had unfæstnian "to unfasten." Related: Unfastened; unfastening.

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Definitions of unfasten

unfasten (v.)
cause to become undone;
unfasten your belt
unfasten (v.)
become undone or untied;
The shoelaces unfastened
From wordnet.princeton.edu