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English definition of “why”

why

adverb
 
 
/waɪ/
A1 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!Question words and expressions
Why don't you?/Why not do sth? A2 used to make a suggestion: Why don't you come with us? Why not give it a try?Suggestions and proposals
why not? informal B1 used to agree with something that someone has suggested: "Let's have an ice cream." "Yes, why not?"Question words and expressions
(Definition of why from the Cambridge Learners Dictionary © Cambridge University Press)
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