Meaning of “cook sth up” in the English Dictionary

british dictionary

"cook sth up" in British English

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cook sth up

phrasal verb with cook uk /kʊk/ us /kʊk/ verb

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)