ever vs for keeps

ever

adv
  • As intensifier following an interrogative word. 

  • In any way. 

  • Continuously, constantly, all the time (for the complete duration). 

  • At any time. 

  • Always, frequently, forever. 

det
  • Shortening of every 

adj
  • Occurring at any time, occurring even but once during a timespan. 

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. 

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