gild vs put lipstick on a pig

gild

verb
  • To give a bright or pleasing aspect to. 

  • To cover with a thin layer of gold; to cover with gold leaf. 

  • To adorn. 

  • To decorate with a golden surface appearance. 

  • To make appear drunk. 

put lipstick on a pig

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

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