verb (v)

• become more extreme(verb.change)

  Example:
  The tension heightened.
  

  Synonym:
  rise
  

  source: wordnet30
• make more extreme; raise in quantity, degree, or intensity(verb.change)

  Example:
  Heightened interest.
  

  source: wordnet30
• increase(verb.change)

  Example:
  Heighten the tension.
  

  Synonym:
  boost, enhance, hike, hike up, raise
  

  source: wordnet30
• increase the height of(verb.motion)

  Example:
  The athletes kept jumping over the steadily heightened bars.
  

  source: wordnet30
• make (one's senses) more acute(verb.change)

  Synonym:
  sharpen
  

  source: wordnet30
• make more intense, stronger, or more marked(verb.change)

  Example:
  Pot smokers claim it heightens their awareness.
  

  Synonym:
  compound, deepen, intensify
  

  source: wordnet30
• To make high; to raise higher; to elevate.(verb)

  source: webster1913