[{"Bold_text": "noun", "List Items": ["a person who sits . sit .", "a brooding hen.", "a person who stays with young children while the parents go out; baby-sitter.", "a person who provides routine or custodial care temporarily or part-time, as for an elderly person or a pet whose owner is on vacation.", "Slang.the buttocks; rump."]}, {"Bold_text": "noun", "List Items": ["Wil·lem de[wil, -, uh, m d, uh],1872–1934,Dutch astronomer and mathematician."]}]