I beg your pardon
see under beg to differ.
Why Isn’t It “Pardon my German?”Pardon my French is one of the most colorful idioms that combines the profane with a language associated with love. But, why is it "French" specifically?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.