Meaning of “what's sth in aid of?” in the English Dictionary

british dictionary

"what's sth in aid of?" in British English

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what's sth in aid of?

UK informal

said when you want to know the reason for something:

What's all this shouting in aid of?

(Definition of “what's sth in aid of?” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)