n.

1. 弧形；曲弧度
2. 小船坞；（道路等中央部分的）拱势

vt.

1. 使成弧形（或中凸形）；使拱起

vi.

1. 成弧形；拱起

n.

1. a slightly convex or arched shape of a road or other horizontal surface.
   ▸Brit. a tilt built into a road at a bend or curve.
2. the slight sideways inclination of the front wheels of a motor vehicle.
3. the extent of curvature of a section of an aerofoil.