[{"Bold_text": "verb (used without object)", "List Items": ["to speak extemporaneously:He can extemporize on any of a number of subjects.", "to sing, or play on an instrument, composing the music as one proceeds; improvise.", "to do or manage something in a makeshift way."]}, {"Bold_text": "verb (used with object)", "List Items": ["to make or devise extempore .", "Music.to compose offhand; improvise."]}]