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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. 2017.
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Examples from the Web for unbolt
Historical Examples
  • Eager as themselves, I hastened to unbolt the door and set them free.

    Confessions Of Con Cregan Charles James Lever
  • You've got to go f'm there to the front an' unbolt the door.

    The Boy Scout Treasure Hunters Charles Henry Lerrigo
  • He was angry that she should have dared to unbolt the door, or to withdraw the bars.

    The Vicar of Bullhampton

    Anthony Trollope
  • This Scott—if he was out of the way, they could unbolt the doors and walk out.

  • Can you get through one of these windows, Ito, and unbolt the door?

    The Mystery Girl Carolyn Wells
  • To be sure he could unbolt the door, and slip away unseen and unheard.

    Barbara Lynn Emily J. Jenkinson
  • She started as the sound of the bell reached her, and hurried out to unbolt the door.

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

    Jan Vedder's Wife

    Amelia Edith Huddleston Barr
  • She stole to unbolt the door and away to warn Christian, when a whisper stayed her.

    The Unknown Sea Clemence Housman
  • He knew he could unlock and unbolt the door and leap out quickly.

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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