[{"Bold_text": "adjective", "List Items": ["(of two objects) meeting with the fronts or heads foremost:a head-on collision.", "facing the direction of forward motion or alignment; frontal.", "characterized by direct opposition:a head-on confrontation."]}, {"Bold_text": "adverb", "List Items": ["with the front or head foremost, especially in a collision:She stepped out of the front door and walked head-on into her husband."]}]