color up vs ruby

color up

verb
  • To blush (to go red). 

  • To exchange a high number of low-value chips (of one color) for a lower number of higher value (of a different color), but keeping the same overall value. 

ruby

verb
  • To make red; to redden. 

noun
  • A deep red colour. 

  • A ruby hummer, a South American hummingbird, Clytolaema rubricauda. 

  • A red bird-of-paradise, Paradisaea rubra. 

  • A pronunciation guide written above or beside Chinese or Japanese characters. 

  • A clear, deep, red variety of corundum, valued as a precious stone. 

  • The tincture red or gules. 

adj
  • Of a deep red colour. 

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