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English definition of “dam sth up”

dam sth up

phrasal verb with dam     /dæm/ verb [T] (-mm-)
to build a dam across a river in order to store water Ditches, 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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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