be up to vs consider

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. 

consider

verb
  • To think of doing. 

  • To believe or opine (that). 

  • To think about seriously. 

  • To have regard to; to take into view or account; to pay due attention to; to respect. 

  • To assign some quality to. 

  • To look at attentively. 

  • To think about something seriously or carefully: to deliberate. 

  • To take up as an example. 

  • To debate (or dispose of) a motion. 

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