clear out vs jettison

clear out

verb
  • to become empty 

  • to remove or eject (from), especially forcibly 

  • To rob or steal from (someone). 

  • to completely empty 

  • To be victorious in gambling against (someone). 

  • to leave quickly 

jettison

verb
  • To let go or get rid of as being useless or defective. 

  • To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load. 

noun
  • Items that have been or are about to be ejected from a boat or balloon. 

  • The action of jettisoning items. 

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