know what you are talking about - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “know what you are talking about”

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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.
Translations of “know what you are talking about”
in Chinese (Traditional) 作經驗之談…
in Chinese (Simplified) 作经验之谈…
(Definition of know what you are talking about from the Cambridge Academic Content Dictionary © Cambridge University Press)
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