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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"
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become more intense;
"The debate intensified"
"His dislike for raw fish only deepened in Japan"
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make deeper;
"They deepened the lake so that bigger pleasure boats could use it"
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become deeper in tone;
"His voice began to change when he was 12 years old"
"Her voice deepened when she whispered the password"