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English definition of “lessen”

lessen

verb [I or T] uk   /ˈles.ən/ us  
C1 If something lessens or is lessened, it becomes less strong: A healthy diet can lessen the risk of heart disease.Becoming and making smaller or lessBecoming and making less strong
(Definition of lessen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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