arouse vs weaken

arouse

verb
  • To stimulate or induce (feelings). 

  • To sexually stimulate. 

  • To cause an erection of the penis or other physical signs of sexual arousal, such as fluid secretion. 

  • To wake from sleep or stupor; to rouse. 

weaken

verb
  • To make weaker or less strong. 

  • To become weaker or less strong. 

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