break-off vs caesura

break-off

noun
  • A break, discontinuance, or interruption 

  • That which breaks off, or is broken off 

  • The first shot in a game of snooker or other cue-game 

verb
  • To play the first shot in a game of snooker 

caesura

noun
  • A break of an era or other measure of history and time; where one era ends and another begins; turning point. 

  • Using two words to divide a metrical foot. 

  • A pause or interruption in a poem, music, building, or other work of art. 

  • The caesura mark ‖ or ||. 

How often have the words break-off and caesura occurred in a corpus of books? (source: Google Ngram Viewer )