put lipstick on a pig vs recommend

put lipstick on a pig

verb
  • To superficially alter something in the hope of making it seem more appealing than it is in actuality. 

recommend

verb
  • To make acceptable; to attract favor to. 

  • To advise, propose, counsel favorably 

  • To bestow commendation on; to represent favourably; to suggest, endorse or encourage as an appropriate choice. 

How often have the words put lipstick on a pig and recommend occurred in a corpus of books? (source: Google Ngram Viewer )