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