invigorate vs ratchet up

invigorate

verb
  • To heighten or intensify. 

  • To impart vigor, strength, or vitality to. 

  • To make lively. 

  • To give life or energy to. 

ratchet up

verb
  • to increase 

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