backflip vs inclination

backflip

noun
  • An act of rotating one's body 360 degrees in the backward direction. 

  • a total reversal in policy or opinion; a volte-face, a U-turn. 

verb
  • To perform a backflip (rotation of body). 

  • To completely reverse a policy or opinion; perform a U-turn. 

inclination

noun
  • A physical tilt or bend. 

  • A tendency. 

  • The angle of intersection of a reference plane 

  • A slant or slope. 

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