"deepen" in the verb sense
1. 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"
2. intensify, deepen
become more intense
"The debate intensified"
"His dislike for raw fish only deepened in Japan"
3. deepen
make deeper
"They deepened the lake so that bigger pleasure boats could use it"
4. deepen, change
become deeper in tone
"His voice began to change when he was 12 years old"
"Her voice deepened when she whispered the password"
Source: WordNet® (An amazing lexical database of English)
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