deaden vs work up

deaden

verb
  • To become less lively; to diminish (by itself). 

  • To make soundproof. 

  • To render less lively; to diminish; to muffle. 

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