stand up vs straighten up

stand up

verb
  • To rise from a lying or sitting position. 

  • To bring something up and set it into a standing position. 

  • To stand immediately behind the wicket so as to catch balls from a slow or spin bowler, and to attempt to stump the batsman. 

  • To launch, propel upwards 

  • (stand someone up) To avoid a prearranged meeting, especially a date, with (a person) without prior notification; to jilt or shirk. 

  • To last or endure over a period of time. 

  • To formally activate and commission (a unit, formation, etc.). 

  • to make one's voice heard, to speak up 

  • To continue to be believable, consistent, or plausible. 

straighten up

verb
  • to sit up straight, to stop hunching. 

  • to start living a reformed life 

  • 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 stand up and straighten up occurred in a corpus of books? (source: Google Ngram Viewer )