[{"Bold_text": "verb (used with object)", "List Items": ["to make flat .", "to knock down:The boxer flattened his opponent in the second round.Synonyms: floor , deck , prostrate , fell , ground"]}, {"Bold_text": "verb (used without object)", "List Items": ["to become flat ."]}, {"Bold_text": "verb phrase", "List Items": ["Aeronautics.to fly into a horizontal position, as after a dive.", "Nautical. flat1(def61) flat1(def61)."]}]