bump up vs richen

bump up

verb
  • To increase something suddenly. 

  • To promote a person to a higher grade. 

  • To give a more prominent place to; to advance position in queue. 

richen

verb
  • To gain richness; become heightened or intensified in brilliancy. 

  • To make or render rich or richer. 

  • To become rich or richer; become superior in quality, condition or effectiveness. 

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