keep on vs outlive

keep on

verb
  • To persist or continue. 

  • To cause or allow to remain in the on or open position. 

  • To cause or allow to remain in an existing position. 

  • To persist in talking about a subject to the annoyance of the listener. 

outlive

verb
  • To live longer; continue to live. 

  • To live through or past (a given time). 

  • To live longer than; continue to live after the death of; overlive; survive. 

  • To surpass in duration; outlast. 

How often have the words keep on and outlive occurred in a corpus of books? (source: Google Ngram Viewer )