castoff vs thumbs down

castoff

noun
  • Something that has been rejected or discarded; a reject. 

adj
  • discarded, rejected. 

thumbs down

noun
  • A rejection or refusal. 

  • A gesture signifying disapproval; a thumb pointing down out of a fist. 

How often have the words castoff and thumbs down occurred in a corpus of books? (source: Google Ngram Viewer )