- v undo the bolt of
- s not firmly fastened or secured
- When morning came, it was discovered that the spikes had been removed from the tracks for a short distance and the fishplates unbolted.
- With a cheerful clanking of governmental wrenches, Revolutionary President Pedro Aramburu last week unbolted some more of the undemocratic machinery put together over a decade by.
- The Age of Reason had unbolted one of the doors of intellectual history.