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English definition of “dam sth up”

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dam sth up

verb [T] uk phrasal verb with dam   /dæm/ (-mm-) us  
to build a dam across a river in order to store water If you dam up your feelings, especially anger or sadness, you do not allow yourself to express or show your feelings in a healthy way.
(Definition of dam sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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