know what one is talking about

idiom

Definition of know what one is talking about

: to be saying what is correct from actual knowledge or experience with something Take her advice. She knows what she's talking about. "He said the movie is boring." "Don't listen to him. He doesn't know what he's talking about."

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“Know what one is talking about.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20what%20one%20is%20talking%20about. Accessed 8 Aug. 2020.

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