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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
  • If you do mistakenly shoot a collared animal, please take the time to unbolt the collar and return it to us.
  • unbolt toilets from the floor and plug the outlet pipe using the same procedure as for floor drains.
  • The first phase was to dewire and unbolt any equipment that could be shut off before the crane arrived.
  • As he reaches to unbolt the reel he loses his balance and falls through the ceiling.
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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