<p><strong>Verb (used with object):</strong></p><ul><li>to open (a door, window, etc.) by or as if by removing a bolt</li><li>to unlock</li><li>to unfasten</li><li>to release, as by the removal of threaded bolts: He unscrewed the nuts and unbolted the inspection cover</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>to become unbolted or unfastened</li></ul>