<p><strong>Verb</strong></p><ul><li>to cause (something) to turn onto its side, face, or back; upset: to overturn a vase</li><li>to destroy the power or validity of; overthrow; defeat: The new findings have not overturned the theory itself.</li><li>Synonyms: conquer</li><li>to reverse (an official or legal decision): Rather than accept defeat, the company filed a complaint in federal appeals court to overturn the ruling.</li></ul><p><strong>Noun</strong></p><ul><li>the act of overturning</li><li>the state of being overturned</li></ul>