verb (v)

• interrupt before its natural or planned end(verb.change)

  Synonym:
  break short, cut short
  

  source: wordnet30
• prevent completion(verb.change)

  Example:
  Break off the negotiations.
  

  Synonym:
  break, discontinue, stop
  

  source: wordnet30
• break off (a piece from a whole)(verb.contact)

  Synonym:
  break away, chip, chip off, come off
  

  source: wordnet30
• break a piece from a whole(verb.contact)

  Synonym:
  break, snap off
  

  source: wordnet30
• break a small piece off from(verb.contact)

  Synonym:
  chip, cut off, knap
  

  source: wordnet30