shale vs strip down

shale

verb
  • To take off the shell or coat of. 

noun
  • A shell or husk; a cod or pod. 

  • A fine-grained sedimentary rock of a thin, laminated, and often friable, structure. 

strip down

verb
  • To remove a part of something. 

  • To remove inessentials from. 

  • To remove all of one's clothing. 

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