be level vs camber

be level

camber

verb
  • To curve upwards in the middle. 

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

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. 

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