confuse vs straighten up

confuse

verb
  • to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand 

  • To mix up, muddle up (one thing with another); to mistake (one thing for another). 

  • To mix thoroughly; to confound; to disorder. 

  • To be confused. 

straighten up

verb
  • to start living a reformed life 

  • to sit up straight, to stop hunching. 

  • to steer straight 

  • to tidy; tidy up 

  • to deal with; put in order 

  • To become straight, or straighter 

  • To clarify 

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