c. 1600, transitive, "to make deep or deeper," from deep (adj.) + -en (1). Intransitive sense of "become deep or deeper" is from 1690s. Related: Deepened; deepening. The earlier verb had been simply deep (Middle English deopen), from Old English diepan.
This event only deepened my convictions
His dislike for raw fish only deepened in Japan
They deepened the lake so that bigger pleasure boats could use it
Her voice deepened when she whispered the password
Deely-bobber
deem
de-emphasize
deep
deep six
deepen
deep-freeze
deeply
deepness
deep-sea
deep-seated
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