pardon my French
the phrase is uttered in an attempt to excuse the user of profanity or curses in the presence of those offended by it under the pretense of the words being part of a foreign language
To add entries to your own vocabulary, become a member of Reverso community or login if you are already a member.
It's easy and only takes a few seconds:
1 to excuse or forgive (a person) for (an offence, mistake, etc.)
to pardon someone, to pardon a fault
a release from punishment for an offence
b the warrant granting such release
4 a Roman Catholic indulgence
pardon me, I beg your pardon
b what did you say?
(C13: from Old French, from Medieval Latin perdonum, from perdonare to forgive freely, from Latin per (intensive) + donare to grant)
English Collins Dictionary - English Definition & Thesaurus