deepen
v 1: make more intense, stronger, or more marked; "The efforts
were intensified", "Her rudeness intensified his dislike
for her", "Potsmokers claim it heightens their
awareness" [syn: {intensify}, {compound}, {heighten}]
2: become more intense; "The debate intensified" [syn: {intensify}]
3: become deeper in tone; "His voice began to change when he
was 12 years old" [syn: {change}]