verb (v)

• diminish in size, scope, or intensity(verb.change)

  Example:
  The war of words between them de-escalated with time.
  

  source: wordnet30
• reduce the level or intensity or size or scope of(verb.change)

  Example:
  De-escalate a crisis.
  

  Synonym:
  step down, weaken
  Antonym:
  escalate, intensify, step up
  

  source: wordnet30