what's sth in aid of? Definition in the Cambridge English Dictionary
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Definition of “what's sth in aid of?” - English Dictionary

Definition of "what's sth in aid of?" - British English Dictionary

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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 Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “what's sth in aid of?”
in Chinese (Simplified) …有什么用?…是怎么回事儿?…
in Chinese (Traditional) …有甚麼用?…是怎麼回事?…