enlighten vs throw off

enlighten

verb
  • To make something clear to (someone); to give knowledge or understanding to. 

  • To supply with light. 

throw off

verb
  • To give forth in an unpremeditated manner. 

  • To expel, reject, or renounce. 

  • Of a horse, to eject its rider. 

  • To introduce errors or inaccuracies; to skew. 

  • To confuse; especially, to lose a pursuer. 

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