[{"Bold_text": "verb (used with object)", "List Items": ["to cause (a train, streetcar, etc.) to run off the rails of a track.", "to cause to fail or become deflected from a purpose; reduce or delay the chances for success or development of:Being drafted into the army derailed his career for two years."]}, {"Bold_text": "verb (used without object)", "List Items": ["(of a train, streetcar, etc.) to run off the rails of a track.", "to become derailed; go astray."]}, {"Bold_text": "noun", "List Items": ["a track device for derailing rolling stock in an emergency."]}]