carousel vs change tack

carousel

verb
  • To revolve or change places. 

noun
  • A tilting match or tournament accompanied by games, shows, and allegorical performances. 

  • An equestrian discipline in which groups of riders make various formations. 

  • A continuously revolving device for item delivery. 

  • A merry-go-round (type of ride on rotating platform). 

  • The rotating glass plate in a microwave oven. 

  • A visual component that displays a horizontal series of items one at a time. 

change tack

verb
  • To change course or heading. 

  • To take a different approach. 

How often have the words carousel and change tack occurred in a corpus of books? (source: Google Ngram Viewer )