Pronunciation: (un-bōlt'), [key]
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.
to become unbolted or unfastened.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.