castoff vs expense

castoff

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

adj
  • discarded, rejected. 

expense

noun
  • The elimination or consumption of something, sometimes with the notion of loss or damage to the thing eliminated. 

  • A spending or consuming, often a disbursement of funds. 

verb
  • To charge a cost against an expense account; to bill something to the company for which one works. 

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