steep vs worth its weight in gold

steep

verb
  • To imbue with something; to be deeply immersed in. 

  • To soak or wet thoroughly. 

noun
  • A rennet bag. 

  • The steep side of a mountain etc.; a slope or acclivity. 

  • A liquid used in a steeping process 

adj
  • expensive 

  • resulting in a mast or windshield angle that strongly diverges from the perpendicular 

  • Of a near-vertical gradient; of a slope, surface, curve, etc. that proceeds upward at an angle near vertical. 

worth its weight in gold

How often have the words steep and worth its weight in gold occurred in a corpus of books? (source: Google Ngram Viewer )