expatiate vs hip-hop

expatiate

verb
  • To range at large, or without restraint. 

  • To write or speak at length; to be copious in argument or discussion. 

hip-hop

verb
  • To move by hopping or with a hopping motion. 

  • To perform hip-hop music. 

noun
  • An Afro-American urban youth culture based on rap music, breakdancing etc. 

  • A form of popular and dance music featuring strong percussion and a powerful rhythm, usually accompanied by rapping. 

How often have the words expatiate and hip-hop occurred in a corpus of books? (source: Google Ngram Viewer )