clear-out vs jettisoning

clear-out

noun
  • The act of emptying a room or space. 

  • A semicircular sweep with the ball grasped firmly in both hands. 

jettisoning

noun
  • The action by which something is jettisoned. 

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