[{"Bold_text": "noun", "List Items": ["Geology.the angle between a fault plane and the vertical, measured perpendicular to the strike of the fault; complement of the dip.", "Mining.the inclination of a vein or seam from the vertical."]}, {"Bold_text": "verb (used without object)", "List Items": ["(of a fault, vein, or seam) to incline from a vertical position."]}]