Hypertext Webster Gateway: "unfasten"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unfasten \Un*fas"ten\, v. t. [1st pref. un- + fasten.]
To loose; to unfix; to unbind; to untie.
From WordNet (r) 1.7 (wn)
unfasten
v 1: cause to become undone; "unfasten your belt" [ant: {fasten}]
2: become undone or untied; "The shoelaces unfastened" [ant: {fasten}]
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