Definition of know what one is talking about
- 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."
: to perceive directly : have direct cognition of
: to have understanding of
: to recognize the nature of : discern
used as an interrogative expressing inquiry about the identity, nature, or value of an object or matter
often used to ask for repetition of an utterance or part of an utterance not properly heard or understood
: in what respect : how
used as an interrogative expressing inquiry about the identity, nature, or value of a person, object, or matter
: how remarkable or striking for good or bad qualities
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