cumshaw vs dumping ground

cumshaw

noun
  • A gratuity or tip as thanks for a service 

verb
  • To give or make a present to. 

dumping ground

noun
  • Any place where unwanted items are sent. 

  • A landfill. 

  • A presumably polyphyletic supraspecific taxon where species of unclear affinities are placed. 

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