(chiefly, UK, idiomatic) To vigorously promote or defend one's interests, views, etc.
1896, The Parliamentary Debates of the United Kingdom of Great Britain and Ireland, vol. XLIII, [https://books.google.ca/books?id=fbI5GDhhwmgC&pg=PA865&dq=%22fought+his+corner%22&hl=en&sa=X&ved=0ahUKEwiv3vHr8dDVAhVp9IMKHfRiChg4ChDoAQgrMA…
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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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