know what (one) is talking about
know what (one) is talking about
To be adequately knowledgeable about or experienced in something one is discussing. Mister, I don't think you know what you're talking about. There's no way these old pipes can withstand that kind of pressure!
See also: know, talk, what
Farlex Dictionary of Idioms.
know what you’re ˈtalking about
(informal) have good knowledge of something; be an expert on something: I really enjoyed that lecture. She certainly knows what she’s talking about. That history teacher doesn’t know what he’s talking about. He makes a lot of mistakes.See also: know, talk, what
Farlex Partner Idioms Dictionary
- know what you're talking about
- know what (one) is doing
- write the book on
- wrote the book on
- wrote the book on (something)
- no stranger to (something)
- know a trick or two
- know a thing or two
- know what (one) is about
- know what you're doing/about