break up vs fragment

break up

verb
  • To break or separate into pieces; to disintegrate or come apart. 

  • To end a (usually romantic or sexual) relationship with each other. 

  • Of a conversation, to cease to be understandable because of a bad connection; of a signal, to deteriorate. 

  • To dissolve; to part. 

  • To break or separate into pieces. 

  • Become disorganised 

  • Of a school, to close for the holidays at the end of term. 

  • be or cause to be overcome with laughter 

  • To end a (usually romantic or sexual) relationship. 

  • To stop a fight; to separate people who are fighting. 

  • To cut or take to pieces for scrap. 

  • To upset greatly; to cause great emotional disturbance or unhappiness. 

fragment

verb
  • To break apart. 

  • To break up and disperse (a file) into non-contiguous areas of a disk. 

  • To cause to be broken into pieces. 

noun
  • An incomplete portion of code. 

  • A sentence not containing a subject or a predicate. 

  • A portion of a URL referring to a subordinate resource or anchor (such as a specific point on a web page), introduced by the # sign. 

  • A part broken off; a small, detached portion; an imperfect part, either physically or not 

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