unfasten

Verb
  1. Cause to become undone (synset 201346975)
    "unfasten your belt"
    causes: unfasten - become undone or untied
    is a type of: undo - cancel, annul, or reverse an action or its effect
    subtypes:
    • unchain - remove the chains from
    • unzip - open the zipper of
    • unbend - unfasten, as a sail, from a spar or a stay
  2. Become undone or untied (synset 201346822)
    "The shoelaces unfastened"
    is a type of: open, open up - become open

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