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Noun: unfastening  ,ún'fã-su-ning
  1. Loosening the ties that fasten something
    "the tying of bow ties is an art; the unfastening is easy";
    - untying, undoing
Verb: unfasten  ,ún'fã-sun
  1. Cause to become undone
    "unfasten your belt"
  2. Become undone or untied
    "The shoelaces unfastened"

Type of: laxation, loosening, open, open up, undo

Antonym: fasten