[ uhn-bohlt ]
See synonyms for: unboltunbolted on Thesaurus.com

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.

Origin of unbolt

1425–75; late Middle English; see un-2 + bolt1

Words Nearby unbolt

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use unbolt in a sentence

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

    Salted With Fire | George MacDonald
  • In the stillness she could hear him open the drawing-room door, then cross the hall and finally unbolt the heavy outer door.

  • She started as the sound of the bell reached her, and hurried out to unbolt the door.

    Averil | Rosa Nouchette Carey
  • 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
  • He suggested that the easiest way was to unbolt the entrance, thereby saving the necessity of breaking it down.

    Uncle Sam Detective | William Atherton Du Puy

British Dictionary definitions for unbolt


/ (ʌnˈbəʊlt) /

  1. to unfasten a bolt of (a door)

  2. 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