condense vs water down

condense

verb
  • To concentrate toward the essence by making more close, compact, or dense, thereby decreasing size or volume. 

  • To be transformed from a gaseous state into a liquid state. 

  • To transform from a gaseous state into a liquid state via condensation. 

water down

verb
  • To simplify or oversimplify; to make easier; to make less difficult. 

  • To make weaker, less effective. 

  • To dilute; to add water to. 

  • To make less restrictive; to make more lenient. 

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