escalate, intensify, step up -- (increase in extent or intensity; "The Allies escalated the bombing")
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")
intensify, deepen -- (become more intense; "The debate intensified"; "His dislike for raw fish only deepened in Japan")
intensify -- (make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark)
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