[{"Bold_text": "verb (used with or without object)", "List Items": ["to arch slightly; bend or curve upward in the middle."]}, {"Bold_text": "noun", "List Items": ["a slight arching, upward curve, or convexity, as of the deck of a ship.", "a slightly arching piece of timber.", "Aeronautics.the rise of the curve of an airfoil, usually expressed as the ratio of the rise to the length of the chord of the airfoil.", "Automotive.the outward or inward tilt of a wheel, called positive when the top tilts outward and negative when it tilts inward, measured as the angle, in degrees, between the vertical and a plane through the circumference of the tire."]}]