who described words and phrases as u or non-u
U and non-U English The debate[clarification needed] was set in motion in 1954 by the British linguist Alan S. C. Ross, professor of linguistics in the University of Birmingham. He coined the terms "U" and "non-U" in an article, on the differences that social class makes in English language usage, published in a Finnish professional linguistics journal.[1] Though his article included differences in pronunciation and writing styles, it was his remark about differences of vocabulary that received the most attention.
Pardon my French At least one source[3] suggests that the phrase "derives from a literal usage of the exclamation. In the 19th century, when English people used French expressions in conversation they often apologized for it - presumably because many of their listeners (then as now) wouldn't be familiar with the language". The definition cites an example from The Lady's Magazine, 1830:[4]