recuperate vs weaken

recuperate

verb
  • To co-opt subversive ideas for mainstream use 

  • To recover, especially from an illness; to get better from an illness. 

weaken

verb
  • To make weaker or less strong. 

  • To become weaker or less strong. 

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