prevent vs work up

prevent

verb
  • To stop (an outcome); to keep from (doing something). 

work up

verb
  • To raise; to excite; to stir up. 

  • To give (a patient) a general medical examination to assess health and fitness. 

  • To develop. 

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