weaken vs wither

weaken

verb
  • To make weaker or less strong. 

  • To become weaker or less strong. 

wither

verb
  • To shrivel, droop or dry up, especially from lack of water. 

  • To become helpless due to emotion. 

  • To lose vigour or power; to languish; to pass away. 

  • To cause to shrivel or dry up. 

  • To make helpless due to emotion. 

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