be up to vs neglect

be up to

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

  • To depend on, to be the choice of. 

neglect

noun
  • Habitual lack of care. 

  • The act of neglecting. 

  • The state of being neglected. 

verb
  • To fail to do or carry out something due to oversight or carelessness. 

  • To fail to care for or attend to something. 

  • To omit to notice; to forbear to treat with attention or respect; to slight. 

  • To ignore for the sake of simplifying calculations without significantly affecting accuracy. 

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