downside vs silver lining

downside

noun
  • A disadvantageous aspect of something that is normally advantageous. 

  • A downward tendency, especially in the price of shares etc. 

  • The side of something that is at the bottom, or that is intended to face downward. 

silver lining

noun
  • A good aspect of a mostly bad event. 

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