non-U
adjective /ˌnɒn ˈjuː/
/ˌnɑːn ˈjuː/
(old-fashioned, informal)- (of language or social behaviour
) not considered socially acceptable among the upper classes语言或社交行为 不为上层阶级所接受的 CultureThe terms U (= upper class) and non-U (= not upper class) were first used by an English professor in 1954 to discuss the speaking habits of English people, but they were made popular and their meaning was extended by Nancy Mitford in her book Noblesse Oblige (1956).词源From the abbreviation U for ‘upper class’.