[ 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

1425–75; late Middle English; see un-2 + bolt1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unbolt

British Dictionary definitions for unbolt

/ (ʌnˈbəʊlt) /

verb (tr)

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