(UK, informal) for the sake of, for (usually placed at the end of a question when quizzing a person about why they have done something).
- What's that coaster in aid of?- This table gets stained by cups very easily.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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