verb (used with object)

  1. to release from or as from fastenings; detach.
  2. to undo or open (something fastened).

verb (used without object)

  1. to become unfastened.


  1. to undo, untie, or open or become undone, untied, or opened

v.early 13c., from un- (2) + fasten. Related: Unfastened; unfastening.

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