be up to vs suffer

be up to

verb
  • To depend on, to be the choice of. 

  • To do or be involved in doing; to do (often something mischievous or inappropriate). 

suffer

verb
  • To endure, undergo. 

  • To become worse. 

  • To undergo hardship. 

  • To feel pain. 

How often have the words be up to and suffer occurred in a corpus of books? (source: Google Ngram Viewer )