chew over vs deliberate

chew over

verb
  • To think deeply about; to ponder or mull over. 

deliberate

verb
  • To consider carefully; to weigh well in the mind. 

  • To consider the reasons for and against anything; to reflect. 

adj
  • Formed with deliberation; carefully considered; not sudden or rash. 

  • Of a person, weighing facts and arguments with a view to a choice or decision; carefully considering the probable consequences of a step; slow in determining. 

  • Done on purpose; intentional. 

  • Not hasty or sudden; slow. 

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