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Definition of deepen : 1. To become deeper; as, the water deepens at every cast of the lead; the plot deepens.
2. To make darker or more intense; to darken; as, the event deepened the prevailing gloom.
3. To make deep or deeper; to increase the depth of; to sink lower; as, to deepen a well or a channel.
4. To make more grave or low in tone; as, to deepen the tones of an organ.
5. To make more poignant or affecting; to increase in degree; as, to deepen grief or sorrow.

Synonyms:

learn, modify, develop, dig, change, rise, baffle, aggravate, switch, acquaint yourself with something, bleach, beef, mystify, catch, retrain, amplify, exchange, decline, be (as) clear as mud, echo, keep up, absorb, amp, confound, compound, deteriorate, color, course, lighten, come in, obscure, raise, transfer, alter, confuse, break, extend, dig out, pick up, slip into, channel, enhance, convert, go off, deafen, boost, blacken, sweep over, interchange, surge, consolidate, train, descend into, grip, run, come over, worsen, ring, grow, expand, acquire, complicate, cast up, gray, pulse, hollow, degenerate, commute, brighten, reverberate, defy, strengthen, bleed, fade, shift, burst, engulf, vary, dash, master, crest, swell, step up, go down, redouble, be beyond someone, spiral, combine, mellow

sink

lower, drop, plunge, shorten, submerge, depress

exaggerate, emphasize, stress, increase, sharpen, intensify, escalate, magnify, heighten, accentuate, underline

Usage examples:

• And she will die too," she continued, as by the fading daylight she saw the pallor deepen on her daughter's face. - "Maggie Miller", Mary J. Holmes.
• However variously expressed, they could scarcely deepen the unavoidable convictions of the world. - "The History of Tasmania, Volume I (of 2)", John West.
• Some missionaries have kept themselves within a limited sphere not far from their homes, visiting the same places again and again, obtaining a personal acquaintance with many of the people, and endeavouring to deepen any impressions which may have been made. - "Life and Work in Benares and Kumaon, 1839-1877", James Kennedy.