clear-out vs effacement

clear-out

noun
  • The act of emptying a room or space. 

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

effacement

noun
  • The act of expunging, of wiping out; expungement. 

  • A shortening, or thinning, of the cervix before or during early labour. 

  • Withdrawal in order to make oneself inconspicuous; the making of oneself inconspicuous. 

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