backflip vs careen

backflip

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

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

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. 

careen

verb
  • To tilt or lean while in motion. 

  • To tilt on one side. 

  • To career, to move rapidly straight ahead, to rush carelessly. 

  • To move swiftly and in an uncontrolled way. 

  • To lurch or sway violently from side to side. 

  • To heave a ship down on one side so as to expose the other, in order to clean it of barnacles and weed, or to repair it below the water line. 

noun
  • The position of a ship laid on one side. 

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