The Collaborative International Dictionary of English v.0.48:

Ridge \Ridge\, v. t. [imp. & p. p. Ridged; p. pr. & vb. n.
   Ridging.]
   1. To form a ridge of; to furnish with a ridge or ridges; to
      make into a ridge or ridges.
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            Bristles ranged like those that ridge the back
            Of chafed wild boars.                 --Milton.
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   2. To form into ridges with the plow, as land.
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   3. To wrinkle. "With a forehead ridged." --Cowper.
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