steam up vs work up

steam up

verb
  • To become steamy. 

  • To become coated with condensation. To fog up. 

  • To bring (a steam boiler) up to working steam pressure. 

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