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cook sth up

informal phrasal verb with cook
 
 
/kʊk/ verb

Definition

to invent a story, plan, etc., usually dishonestly: She'd 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.Cheating and trickingPlotting and trapping
(Definition of cook sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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