prepare vs weaken

prepare

verb
  • To make ready for eating or drinking; to cook. 

  • To make ready for a specific future purpose; to set up; to assemble or equip. 

  • To produce or make by combining elements; to synthesize, compound. 

  • To make oneself ready; to get ready, make preparation. 

weaken

verb
  • To make weaker or less strong. 

  • To become weaker or less strong. 

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