1. not fastened or secured, as with a bolt or bolts.


  1. not sifted, as grain.

verb (used with object)

  1. to open (a door, window, etc.) by or as if by removing a bolt; unlock; unfasten.
  2. to release, as by the removal of threaded bolts: He unscrewed the nuts and unbolted the inspection cover.

verb (used without object)

  1. to become unbolted or unfastened.


  1. (of grain, meal, or flour) not sifted

verb (tr)

  1. to unfasten a bolt of (a door)
  2. to undo (the nut) on a bolt

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