un-bolt

unbolt

[uhn-bohlt]
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)
3.
to become unbolted or unfastened.

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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbolt (ʌnˈbəʊlt)
 
vb
1.  to unfasten a bolt of (a door)
2.  to undo (the nut) on a bolt

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