beetroot vs set fire

beetroot

verb
  • To turn a bright red or purple colour. 

noun
  • A normally deep-red-coloured root vegetable usually cooked or pickled before eating; Synonym of beet. 

  • The edible part of the root of a beet plant, raw or prepared. 

set fire

verb
  • To light using fire; to cause to be on fire; to set alight. 

How often have the words beetroot and set fire occurred in a corpus of books? (source: Google Ngram Viewer )