I'm American and have never heard this idiom. But I found it in an idiom dictionary - it is a British expression. com/corner to defend something that you believe in by arguing.
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AnonymousMy take on this is that in US English this would mean that a boxer is violently disagreeing with the advice given to him by his handlers in his corner. Between rounds a boxer sits in his corner and his handlers give him advice. Some boxers refuse to heed the advice and continue to fight the fight in their own wayI disagree. It applies to any argument