"intensifies" in the verb sense
1. escalate, intensify, step up
increase in extent or intensity
"The Allies escalated the bombing"
2. intensify, compound, heighten, deepen
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"
3. intensify, deepen
become more intense
"The debate intensified"
"His dislike for raw fish only deepened in Japan"
make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark
Source: WordNet® (An amazing lexical database of English)
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