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English definition of “know what's what”

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know what's what

informal
If you know what's what, you have a lot of experience and can judge people and situations well: Linda's been in the business for 30 years - she knows what's what.
Translations of “know what's what”
in Chinese (Traditional) 在行, 老練…
in Chinese (Simplified) 懂行, 老练…
(Definition of know what's what from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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