[{"Bold_text": "noun", "List Items": ["the harsh, throaty cry of a duck or any similar sound."]}, {"Bold_text": "verb (used without object)", "List Items": ["to utter the cry of a duck or a sound resembling it."]}, {"Bold_text": "noun", "List Items": ["a fraudulent or ignorant pretender to medical skill:Desperation for a cure led her to a quack who took her money.", "a person who pretends, professionally or publicly, to have skill, knowledge, or qualifications they do not possess; a charlatan .Synonyms: phony , mountebank"]}, {"Bold_text": "adjective", "List Items": ["being a fraudulent or ignorant pretender to skills, especially medical skills:He's just a quack psychologist who complicates everyone's problems.", "presented falsely as having curative powers:quack medicine.", "of, relating to, or befitting a quack or quackery :Her quack methods have helped no one."]}, {"Bold_text": "verb (used with object)", "List Items": ["to treat in the manner of a fraudulent or ignorant pretender to medical skill.", "to advertise or sell with fraudulent claims."]}]