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English definition of “dream sth up”

dream sth up

phrasal verb with dream     /driːm/ verb (dreamed or dreamt, dreamed or dreamt)
to invent something very unusual and usually silly: This is the latest ploy dreamed up by advertising companies to sell their new products.Inventing, designing and innovationCreating and producing
(Definition of dream sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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