boil up vs parboil

boil up

verb
  • To cook or prepare by boiling. 

  • To become more excited, intense or exciting. 

noun
  • A traditionally Maori soup/stew made with potatoes, pork and other ingredients. 

parboil

verb
  • To boil food briefly so that it is partly cooked. 

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