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Definitions of deepen:

verb:   become deeper in tone
Example: "Her voice deepened when she whispered the password"

verb:   make deeper
Example: "They deepened the lake so that bigger pleasure boats could use it"

verb:   become more intense
Example: "His dislike for raw fish only deepened in Japan"

verb:   make more intense, stronger, or more marked
Example: "This event only deepened my convictions"

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Alternative Terms
aggravate enhance heighten intensify redouble increase-decrease compound deepen change depthen brighten association-for-the-development-of-human-potential fosi andrew-linzey satori hydro-fracturing labyrinth-karst mucogingival-surgery university-of-the-trees congenital-hip-dysplasia-treatment dredge salp-tri-re-hospital-la hip-lito-yrigoyen

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