take a turn vs vary

take a turn

verb
  • Change in direction, tone, or tendency. 

  • To participate in an activity involving two or more participants. 

  • To walk around; to stroll. 

vary

verb
  • To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation. 

  • To make of different kinds; to make different from one another; to diversity; to variegate. 

  • To be or act different from the usual. 

  • Not to remain constant: to change with time or a similar parameter. 

  • To institute a change in, from a current state; to modify. 

  • To change with time or a similar parameter. 

  • To display differences. 

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