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.

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)
1.  to unfasten a bolt of (a door)
2.  to undo (the nut) on a bolt

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If you do mistakenly shoot a collared animal, please take the time to unbolt the collar and return it to us.
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.
Unbolt toilets from the floor and plug the outlet pipe using the same procedure as for floor drains.
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