why not

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why not

1. Why is that not the case? What is the reason for your negative statement? A: "George has decided he's not going to join." B: "Why not?" A: "I don't like coconut." B: "Why not? Because of the texture?"
2. Yes, because there is no good reason to say no. A: "Would you like another glass of wine?" B: "Sure, why not?"
See also: not, why
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Why not?

1. Lit. Please explain your negative answer. Mother: No, you can't. Mary: Why not? Sue: Could I have another piece of cake? Mary: No. Sue: Why not? Mary: I want it.
2. . Inf. I cannot think of a reason not to, so yes. Bob: You want to go to see a movie next Friday? Jane: Why not? Fred: Do you feel like wandering over to the bowling alley? Tom: Why not?
See also: why
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

ˌwhy ˈnot?

(informal) used to make a suggestion, or agree to a suggestion: ‘Why not go and see a movie?’ ‘OK.’‘Let’s go and see a movie.’ ‘OK, why not?’
See also: why
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
"Why not start counting at a half of one?" asked the Saw-Horse, abruptly.
Why not still proceed over the untamed yet obedient element?
"Then," suggested the idea, with a blush for its own absurdity, "why not go on pilgrimage and seek her?
But dreams--of those who dream as I, Aspiringly, are damned, and die: Yet should I swear I mean alone, By notes so very shrilly blown, To break upon Time's monotone, While yet my vapid joy and grief Are tintless of the yellow leaf-- Why not an imp the graybeard hath, Will shake his shadow in my path-- And e'en the graybeard will o'erlook Connivingly my dreaming-book.
Why not break out at her on the spot and have it all over?-- give it to her straight in her lovely little lighted face?
"Why not?" said Natasha, without changing her position.
The Why Not Inn has been owned since last October by Dave Cooper, whose The Black and White Pub Company runs 10 pubs, mainly in the Black Country.
Why Not is also about to team for the first time with Britain's Ken Loach for a film based on Gallic striker Eric Cantona's soccer glory with Manchester United.
Where drugs may not be available, why not use the natural approach to curb postpartum bleeding, namely, encourage breast-feeding?
So why not be all three, why not be a Hindu, a Muslim and a Christian?
Why not say the opposite, that they should be kept separate.
Why not spend all the money APSP receives on member benefits and promotions every year?
And while you are there, why not go through the Professional Development Series?
(One of art's dirty little secrets, said Koolhaas, was that it doesn't like competition.) Why not display the building's history rather than create yet another iconic venue?