beetroot vs fire up

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. 

fire up

verb
  • To ignite. 

  • To excite; to infuse with energy. 

  • Of an engine or similar, to start. 

  • To launch; to run. 

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