| 1. | to arch slightly; bend or curve upward in the middle. |
| 2. | a slight arching, upward curve, or convexity, as of the deck of a ship. |
| 3. | a slightly arching piece of timber. |
| 4. | 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. |
| 5. | 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. |
