shape up vs straighten up

shape up

verb
  • To take shape; to transform into or become. 

  • To improve; to correct one's bad habits or behavior. 

straighten up

verb
  • To become straight, or straighter 

  • 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 clarify 

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