Why-not Definition

noun
(obsolete) A violent and peremptory procedure without any assigned reason; a sudden conclusive happening.
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adverb
Why is that not true?
I don't want to go out today. — Why not?
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Used to state that one has no objection to and approves of a proposal.
Let's have pizza for lunch. — Yes, why not?
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Used to introduce a proposal.
Why not try turning the handle in the other direction to see if that opens the window?
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