pinch off vs yank

pinch off

verb
  • To separate (something) from something else, using a pinching motion. 

yank

verb
  • To pull (something) with a quick, strong action. 

  • To remove from distribution. 

noun
  • A sudden, vigorous pull (sometimes defined as mass times jerk, or rate of change of force). 

  • A Yankee. 

  • A masturbation session. 

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