chopped liver vs unoriginal

chopped liver

noun
  • A person or object not worthy of being noticed; someone or something insignificant. 

  • A Jewish pâté-like food made by mincing beef or chicken liver and onions which have been broiled or fried in schmaltz (“chicken fat”) together with hard-boiled eggs; it is usually spread on to bread. 

unoriginal

noun
  • A person or work that does not exhibit originality. 

adj
  • Not being the first or earliest version of something, not original. 

  • Lacking originality. 

How often have the words chopped liver and unoriginal occurred in a corpus of books? (source: Google Ngram Viewer )