[{"Bold_text": "noun", "List Items": ["any of various devices for a guitar, lute, banjo, etc., that when clamped or screwed down across the strings at a given fret will raise each string a corresponding number of half tones.", "the nut of a guitar, lute, banjo, etc."]}, {"Bold_text": "noun", "List Items": ["the chief of a branch of the Mafia."]}]