[{"Bold_text": "verb (used with or without object)", "List Items": ["to move or distract from the main subject or course.", "to move from the main track to a siding, as a train."]}, {"Bold_text": "noun", "List Items": ["any railroad track, other than a siding, that is auxiliary to the main track.", "a path, position, project, topic, etc., of less importance than the main one:On a sidetrack to this thread on workplace safety, let me just say a little about office footwear."]}]