throw off vs turn one's coat

throw off

verb
  • To expel, reject, or renounce. 

  • To give forth in an unpremeditated manner. 

  • Of a horse, to eject its rider. 

  • To introduce errors or inaccuracies; to skew. 

  • To confuse; especially, to lose a pursuer. 

turn one's coat

verb
  • To turn against a previous affiliation or allegiance. 

  • Used other than figuratively or idiomatically: see turn, coat. 

How often have the words throw off and turn one's coat occurred in a corpus of books? (source: Google Ngram Viewer )