[{"Bold_text": "interjection", "List Items": ["(used to call attention to an impending danger or the need for immediate alertness.)"]}, {"Bold_text": "adjective", "List Items": ["quick to grasp a situation and take advantage of opportunities; alert; resourceful."]}, {"Bold_text": "noun", "List Items": ["a warning in advance:sending a heads-up to the Pentagon about possible attacks."]}]