What does (one) know?

(redirected from what do they know)

what do I know

Used to emphasize that what was just said is merely a guess or assumption. (Sometimes used sarcastically.) If I had to take a guess, I'd say that the fan belt is loose. But I'm not a mechanic, so what do I know? If the country keeps trading at such unprofitable rates, there's no way we'll be out of this recession in the next five years. But what do I know, I'm only the top economist in the Midwest.
See also: know, what

What does (one) know?

A rhetorical question meant to indicate that one's opinion or claim isn't trustworthy, believable, or welcome. Sometimes used ironically or sarcastically. A: "You really shouldn't be eating so much red meat." B: "Ah, what do you know? Red meat helps make you strong!" A: "All the healthcare experts out there say babies ought to be breastfed exclusively." B: "Bah, what do they know? My siblings and I were all bottle fed, and we turned out just fine." So, what, you think I'm wrong about climate change because of some article you read on Facebook? I mean, I only have a PhD in climatology, what do I know?"
See also: does, what
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

What do you know (about that)?

Inf. That is very interesting. Tom: I heard that Jim and Mary are getting married. Jane: Well! What do you know about that? What do you know? Bill finally sold his house!
See also: what

What do you know?

Inf. a typical inquiry on greeting someone. (A specific answer is not expected. Often pronounced "Wha-da-ya know?") Bob: Hey, Tom! What do you know? Tom: Look who's here! Hi, Bob! John: What do you know? Mary: Nothing. How are you? John: Okay.
See also: what
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

what do you know

What a surprise, as in What do you know, our suitcases are the first off the plane. [Early 1900s]
See also: know, what
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

what do you know (about that)?

used as an expression of surprise. informal, chiefly North American
See also: what
Farlex Partner Idioms Dictionary © Farlex 2017

(well) what do you ˈknow (about ˈthat)?

(informal) used to express surprise: Well, what do you know? Look who’s here!
See also: what
Farlex Partner Idioms Dictionary © Farlex 2017
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