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English definition of “think sth up”

think sth up

verb uk phrasal verb with think   /θɪŋk/ (thought, thought) us  
to produce a new idea or plan: I don't want to go tonight but I can't think up a good excuse.Inventing, designing and innovationCreating and producing
(Definition of think sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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