diehard vs true blue

diehard

adj
  • Unreasonably or stubbornly resisting change. 

  • Fanatically opposing progress or reform. 

  • Complete; having no opposite opinion of anything in a particular topic of one's values; thorough of in one's beliefs. 

noun
  • A person with such an attitude. 

true blue

adj
  • Steadfastly faithful or loyal; unwavering in loyalty; staunch, true. 

  • Representing the true essence of something; authentic, genuine, honest. 

  • Of or pertaining to the (historical) Tory, and now the Conservative, political party; hence, steadfastly conservative. 

  • Of or pertaining to the Scottish Presbyterian or Whig political party in the 17th century; hence, steadfastly Presbyterian. 

  • Representing authentic Australian culture, values, etc. 

  • Patriotic. 

  • Used other than figuratively or idiomatically: see true, blue. 

  • Aristocratic by birth. 

noun
  • A precisely defined pure blue, as for example web color #0000FF = RGB(0,0,255). 

  • A blue dye from Coventry, England, famous for not washing out. 

  • A faithful partisan or supporter of a cause, person, political party, etc. 

How often have the words diehard and true blue occurred in a corpus of books? (source: Google Ngram Viewer )