E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Façon de Parler.
Idiomatic or usual form of speech, not meant to be offensive. I once told a waiter in Norway that the meat he brought me for breakfast was not sufficiently cooked; and he bluntly told me it was not true (det er ikkc sandt), but he did not intend to be rude. It was the Norwegian façon de parler.