egg on vs work up

egg on

verb
  • To encourage or coax a person to do something, especially something foolhardy or reckless. 

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 egg on and work up occurred in a corpus of books? (source: Google Ngram Viewer )