verb (v)

• represent as less significant or important(verb.communication)

  Synonym:
  downplay, minimize, understate
  Antonym:
  amplify, exaggerate, hyperbolise, hyperbolize, magnify, overdraw, overstate
  

  source: wordnet30
• make small or insignificant(verb.change)

  Synonym:
  minimize
  Antonym:
  maximise, maximize
  

  source: wordnet30