why not...? Meaning in the Cambridge English Dictionary
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Meaning of “why not...?” in the English Dictionary

"why not...?" in British English

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why not...?

B1 used to make a ​suggestion or to ​expressagreement: Why not use my ​car? You'll ​fit more in. "Let's go out for an ​Italiantonight." "Yes, why not?"
(Definition of why not...? from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"why not" in American English

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why not

used for making a ​suggestion: If you’re so ​unhappy, why not ​leave? why not Why not is also used for ​expressingagreement: "Do you ​want Italian ​foodtonight?" "Sure, why not."
(Definition of why not from the Cambridge Academic Content Dictionary © Cambridge University Press)
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