Excuse my French
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excuse (or pardon) my Frenchused to apologize for swearing. informal
French has been used since the late 19th century as a euphemism for bad language.
1992 Angela Lambert A Rather English Marriage A loony can change a bloody toilet-roll, pardon my French.
exˌcuse/ˌpardon my ˈFrench(informal, humorous) used for saying you are sorry when you have used or are going to use rude or offensive language: Ouch, bloody hell! Oops, excuse my French! ♢ If you’ll pardon my French, he’s a bloody fool.
Excuse my Frenchverb
See Pardon my French