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An embarrassing blunder or breach of proper etiquette, often made in front of other people. Daria didn't realize she had made such a faux pas when she went to use her salad fork to eat the main course.
(make/commit) a ˌfaux ˈpas(from French) an action or a remark that causes embarrassment because it is not socially correct: I immediately made a faux pas when I forgot to take my shoes off before I went into the house. ♢ They were kind enough to overlook my faux pas and continued as if nothing had happened.
The meaning of the French expression is ‘wrong step’.