Meaning of “know what's what” in the English Dictionary

british dictionary

"know what's what" in British English

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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.

(Definition of “know what's what” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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