intensify 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. become more intense
   "The debate intensified"; "His dislike for raw fish only deepened in Japan"
   intensify  deepen 
   
3. increase in extent or intensity
   "The Allies escalated the bombing"
   escalate  intensify  step up 
   
4. make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark
   intensify