deepen Definition in the Cambridge English Dictionary
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Definition of “deepen” - English Dictionary

Definition of "deepen" - American English Dictionary

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deepenverb [I/T]

 us   /ˈdi·pən/
to ​become more ​stronglyfelt or ​experienced, or to make something this way: [I] Over the ​years, her ​love for him deepened.
(Definition of deepen from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "deepen" - British English Dictionary

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deepenverb

uk   us   /ˈdiː.pən/

deepen verb (DOWN)

[I or T] to make something ​deeper, or to ​becomedeeper: One way of ​preventingfurtherflooding would be to deepen the ​riverbed. The ​seabed deepens here to 5,000 ​metres.

deepen verb (STRONGLY FELT)

C2 [I or T] to ​become more ​stronglyfelt or ​experienced, or to make something this way: Over the ​years, her ​love for him deepened. The ​economiccrisis is deepening. We must ​try not to deepen ​existingsplits within the ​party.

deepen verb (COMPLICATED)

C1 [I or T] to make something ​increase or ​become more ​serious: It ​certainlyhelped to deepen my ​understanding of the ​situation.

deepen verb (LOW)

[I] to ​becomelower: Boys' ​voices deepen in ​their early to mid-teens.

deepen verb (DARK)

[I] to ​becomedarker: The ​shadows deepened as the ​sundropped below the ​horizon.
(Definition of deepen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "deepen" - Business English Dictionary

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deepenverb [I or T]

uk   us   /ˈdiːpən/
to ​increase or become more serious; to make something ​increase or become more serious: There are fears that the ​crisis in the Pacific ​region could deepen considerably. Some ​experts say ​raisinginterestrates to fight ​inflation might deepen the ​economicslowdown. To deepen its ​relationships with advertisers, the ​company has begun to ​offercorporatecustomersaccess to ​research about ​onlineconsumers.
(Definition of deepen from the Cambridge Business English Dictionary © Cambridge University Press)
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