stab in the back vs treason

stab in the back

noun

  • An act of betrayal or treachery 

verb

  • To betray (somebody). 

treason

noun

  • An act of treachery, betrayal of trust or confidence. 

  • The crime of betraying one’s own country. 

How often have the words stab in the back and treason occurred in a corpus of books? (source: Google Ngram Viewer )