why
/waɪ/ adverbDefinition
› used to ask or talk about the reasons for something: Why didn't you call me? I wonder why he didn't come. So that's the reason why he asked her!
Why don't you?/Why not do sth? › used to make a suggestion: Why don't you come with us? Why not give it a try?
why not? informal › used to agree with something that someone has suggested: "Let's have an ice cream." "Yes, why not?"
(Definition of why adverb from the Cambridge Learner's Dictionary
© Cambridge University Press)
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