Search Result for "unfasten": 
Wordnet 3.0

VERB (2)

1. cause to become undone;
- Example: "unfasten your belt"

2. become undone or untied;
- Example: "The shoelaces unfastened"



The Collaborative International Dictionary of English v.0.48:

Unfasten \Un*fas"ten\, v. t. [1st pref. un- + fasten.]
   To loose; to unfix; to unbind; to untie.
   [1913 Webster]


WordNet (r) 3.0 (2006):

unfasten
    v 1: cause to become undone; "unfasten your belt" [ant:
         fasten, fix, secure]
    2: become undone or untied; "The shoelaces unfastened" [ant:
       fasten]