for keeps vs till blue in the face

for keeps

prep
  • With an agreement or intention to retain what one gains or receives. 

  • Permanently, so that one can keep something indefinitely. 

  • With a strong competitive resolve to win or succeed, as in sports or business. 

till blue in the face

How often have the words for keeps and till blue in the face occurred in a corpus of books? (source: Google Ngram Viewer )