rectify vs straighten up

rectify

verb
  • To restore (someone or something) to its proper condition; to straighten out, to set right. 

  • To adjust (a globe or sundial) to prepare for the solution of a proposed problem. 

  • To determine the length of a curve included between two limits. 

  • To purify or refine (a substance) by distillation. 

  • To produce (as factitious gin or brandy) by redistilling bad wines or strong spirits (whisky, rum, etc.) with flavourings. 

  • To remedy or fix (an undesirable state of affairs, situation etc.). 

  • To convert (alternating current) into direct current. 

  • To correct or amend (a mistake, defect etc.). 

straighten up

verb
  • to tidy; tidy up 

  • to start living a reformed life 

  • to sit up straight, to stop hunching. 

  • to steer straight 

  • to deal with; put in order 

  • To become straight, or straighter 

  • To clarify 

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