verb (v)

• become quiet or calm, especially after a state of agitation(verb.emotion)

  Example:
  After the fight both men need to cool off..
  

  Synonym:
  calm, calm down, chill out, cool it, settle down, simmer down
  

  source: wordnet30
• lose intensity(verb.change)

  Synonym:
  cool, cool down
  

  source: wordnet30
• feel less enamoured of something or somebody(verb.emotion)

  source: wordnet30