roughen['rʌfən]

• vt.
  • 使粗糙；使不平滑：

    Her hands were roughened by housework.

    她的手由于家务劳动而变得粗糙。

    You'd better roughen the surface before applying the paint.

    你最好先把表面弄毛糙再涂颜料。

• vi.
  • 变粗糙；变得不平：

    As time went on,the surface of the highway roughened.

    随着时间的推移，公路的路面变得崎岖不平了。