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English definition of “what's cooking?”

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what's cooking?

old-fashioned slang
used to ask about what is happening or what someone is planning: I just saw the police arrive - what's cooking?
Translations of “what's cooking?”
in Chinese (Traditional) 發生甚麽事了?怎麽回事?在幹甚麽?…
in Chinese (Simplified) 发生什么事了?怎么回事?在干什么?…
(Definition of what's cooking? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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