formal a polite way of saying that you disagree with something that someone has said.
I beg to differ with Mr Stahl's final assertion.
I beg to disagree
I politely disagree. I'm sorry, headmaster, but I beg to disagree. Students at this school should have more access to financial aid and scholarships, not less.He thinks that the evening was a disaster, but I beg to disagree—I saw plenty of guests enjoying themselves!