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English definition of “dam sth up”

dam sth up

verb [T] uk phrasal verb with dam   /dæm/ (-mm-) us  
to build a dam across a river in order to store waterDitches, dams and tunnelsClosing and blocking 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.Controlling emotionsCalm and relaxedNot showing or feeling emotions
(Definition of dam sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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