Meaning of “know what you are talking about” in the English Dictionary

american-english dictionary

"know what you are talking about" in British English

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know what you are talking about

C1 to understand a subject because of your experience:

He doesn't know what he's talking about - he's never even been to Africa.

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

"know what you are talking about" in American English

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know what you are talking about

to be able to speak in an informed way because of your experience or education:

He doesn’t know what he’s talking about – he’s never even been to Alaska.

(Definition of “know what you are talking about” from the Cambridge Academic Content Dictionary © Cambridge University Press)

Translations of “know what you are talking about”
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