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[uhn-bohlt] /ʌnˈboʊlt/
verb (used with object)
to open (a door, window, etc.) by or as if by removing a bolt; unlock; unfasten.
to release, as by the removal of threaded bolts:
He unscrewed the nuts and unbolted the inspection cover.
verb (used without object)
to become unbolted or unfastened.
Origin of unbolt
late Middle English
1425-75; late Middle English; see un-2 + bolt1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for unbolt
Historical Examples
  • No answer followed this summons, and now Dalton, after some vain efforts to unbolt the door, strode over it into the shop.

    The Daltons, Volume II (of II) Charles James Lever
  • Eager as themselves, I hastened to unbolt the door and set them free.

    Confessions Of Con Cregan Charles James Lever
  • One of the shutters was ajar, admitting a few gleams of light, by which she could see to unbolt the door.

    A Noble Woman Ann S. Stephens
  • To be sure he could unbolt the door, and slip away unseen and unheard.

    Barbara Lynn Emily J. Jenkinson
  • What in heaven's name can it be'—I started to unbolt the door.

  • I say to thee, unbolt the door, unbolt it quick, lest thou be too late.

    Jan Vedder's Wife Amelia Edith Huddleston Barr
  • It was an easy matter to unbolt a side door, and make their way through the garden and down the drive.

  • She had neither to unlock nor unbolt the door to leave the house, for it was never made fast.

    Salted With Fire George MacDonald
  • He would have time to unbolt the kitchen door, even if it were not already open, for Fane was far, far behind.

    Under False Pretences Adeline Sergeant
  • I repeated the manoeuvre of pretending to unbolt the door, and smiled as I heard him literally dancing with frenzy inside.

    The Uttermost Farthing R. Austin Freeman
British Dictionary definitions for unbolt


verb (transitive)
to unfasten a bolt of (a door)
to undo (the nut) on a bolt
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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