arraignment vs bum rap

arraignment

noun
  • The formal charging of a defendant with an offense. 

bum rap

noun
  • A false accusation, or an injustice, especially one that leads to imprisonment. 

  • An undeservedly unfavorable portrayal or reputation. 

How often have the words arraignment and bum rap occurred in a corpus of books? (source: Google Ngram Viewer )