[{"Bold_text": "noun", "List Items": ["the reversing of what has been done; annulling.Synonyms: negation , reversal", "a bringing to destruction, ruin, or disaster.", "a cause of destruction or ruin.", "the act of unfastening or loosing.", "Psychiatry.an unconscious defense mechanism through which an attempt is made to reverse a psychologically unacceptable act by doing its opposite, usually repetitiously, in order to relieve anxiety."]}]