heighten in WordNet English dictionary

1. make more intense, stronger, or more marked
   "The efforts were intensified", "Her rudeness intensified his dislike for her"; "Pot smokers claim it heightens their awareness"; "This event only deepened my convictions"
   intensify  compound  heighten  deepen 
   
2. increase
   "This will enhance your enjoyment"; "heighten the tension"
   enhance  heighten  raise 
   
3. become more extreme
   "The tension heightened"
   heighten  rise 
   
4. make more extreme; raise in quantity, degree, or intensity
   "heightened interest"
   heighten 
   
5. make (one's senses) more acute
   "This drug will sharpen your vision"
   sharpen  heighten 
   
6. increase the height of
   "The athletes kept jumping over the steadily heightened bars"
   heighten