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

british dictionary

"why not...?" in British English

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why not...?

B1 used to make a suggestion or to express agreement:

Why not use my car? You'll fit more in.
"Let's go out for an Italian tonight." "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 expressing agreement:

"Do you want Italian food tonight?" "Sure, why not."

(Definition of “why not” from the Cambridge Academic Content Dictionary © Cambridge University Press)