[{"Bold_text": "noun", "List Items": ["a weak, ineffectual, timid person."]}, {"Bold_text": "verb phrase", "List Items": ["Informal.to be or act like a wimp.to show timidity or cowardice; chicken out.", "to be or act like a wimp.", "to show timidity or cowardice; chicken out."]}, {"Bold_text": "noun", "List Items": ["any of a group of weakly interacting elementary particles predicted by various unified field theories, as the W particle and Z-zero particle, that are characterized by relatively large masses."]}]