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The Collaborative International Dictionary of English v.0.48 (gcide)

Deepen \Deep"en\, v. t. [imp. & p. p. {Deepened}; p. pr. & vb.
n. {Deepening}.]
1. To make deep or deeper; to increase the depth of; to sink
lower; as, to deepen a well or a channel.
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It would . . . deepen the bed of the Tiber.
--Addison.
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2. To make darker or more intense; to darken; as, the event
deepened the prevailing gloom.
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You must deepen your colors. --Peacham.
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3. To make more poignant or affecting; to increase in degree;
as, to deepen grief or sorrow.
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4. To make more grave or low in tone; as, to deepen the tones
of an organ.
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Deepens the murmur of the falling floods. --Pope.
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