dirty laundry vs laundry basket

dirty laundry

noun
  • A clothes hamper or other container in which soiled laundry is placed. 

  • Used other than figuratively or idiomatically: see dirty, laundry. 

  • Unflattering or embarrassing facts, or questionable activities that one wants to remain secret, but which someone else may use as blackmail. 

laundry basket

noun
  • A container, often made of plastic, for holding and transporting clothing and household textiles, especially before and after being laundered. 

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