beetroot vs brighten

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. 

brighten

verb
  • To make bright or brighter in color. 

  • To make illustrious, or more distinguished; to add luster or splendor to 

  • To make more cheerful and pleasant; to enliven 

  • To grow bright, or more bright in color; to clear up 

  • To become brighter or more cheerful in mood 

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