[{"Bold_text": "noun", "List Items": ["a river in northern Italy flowing east into the Adriatic. 15 miles (24 km) long: crossed by Julius Caesar when he marched against Rome in 49 b.c.", "Sometimesrubicon.the act that commits someone to a particular course; point of no return:Publication serves as a Rubicon for authors, since they will be unable to edit their work afterward."]}]