Longman Dictionary of Contemporary English homepage

deepen

verb
     
deep‧en
1

get worse

[intransitive] if a serious situation deepens, it gets worse - used especially in news reports:
The recession continues to deepen.
a deepening international crisis
2

become stronger

[intransitive and transitive] to become stronger or greater, or to make something stronger or greater:
Jeanne liked Simon as a friend but she did not want the relationship to deepen.
The idea only deepened his gloom.
The mystery deepened (=became even more mysterious).
Students explore new ideas as they deepen their understanding (=understand more) of the subject.
3

expression on somebody's face

[intransitive] literary if someone's smile or frown deepens, they smile even more or frown even more:
Her worried frown deepened.
4

water

[intransitive and transitive] if water deepens, or if someone deepens it, it becomes deeper:
The river deepens beyond the town.
The harbour was deepened to take bigger boats.
5

colour

[intransitive] literary if light or a colour deepens, it becomes darker:
The twilight deepened.
6

sound

[intransitive] if a sound deepens, it becomes lower:
His voice deepened as he relaxed.
7

breath

[intransitive] if your breathing deepens, you take more air into your lungs

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