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English definition of “cook sth up”

cook sth up

informal
verb uk phrasal verb with cook   /kʊk/ us  
to invent a story, plan, etc., usually dishonestly: She cooked up some weird scheme that was going to earn her a fortune. I had to cook up an excuse about my car breaking down.
(Definition of cook sth up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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