camber vs downgrade

camber

noun
  • The slope of a curved road created to minimize the effect of centrifugal force. 

  • An upward concavity in the underside of a beam, girder, or lintel; also, a slight upward concavity in a straight arch. 

  • The alignment on the roll axis of the wheels of a road vehicle, where positive camber signifies that the wheels are closer together at the bottom than the top. 

  • The curvature of an airfoil. 

  • A small enclosed dock in which timber for masts (etc.) is kept to weather. 

  • A slight convexity, arching or curvature of a surface of a road, beam, roof, ship's deck etc., so that liquids will flow off the sides. 

verb
  • To curve upwards in the middle. 

  • To adjust the camber of the wheels of a vehicle. 

downgrade

noun
  • A downhill gradient on a road or railway. 

  • A reduction of a rating, as a financial or credit rating. 

verb
  • to reduce the official estimate of a storm's intensity. 

  • To reduce in complexity, or remove unnecessary parts; to dumb down. 

  • To place lower in position. 

  • To revert software back to an older version. 

  • To disparage. 

How often have the words camber and downgrade occurred in a corpus of books? (source: Google Ngram Viewer )