engender vs work up

engender

verb
  • To bring into existence (a situation, quality, result etc.); to give rise to, cause, create. 

  • To assume form; to come into existence; to be caused or produced. 

  • To give existence to, to produce (living creatures). 

  • To endow with gender; to create gender or enhance the importance of gender. 

work up

verb
  • To develop. 

  • To raise; to excite; to stir up. 

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

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