English version

four-letter word

From Longman Dictionary of Contemporary Englishfour-letter wordˌfour-letter ˈword noun [countable]  SWEARa word that is considered very rude and offensive, especially one relating to sex or body waste syn swearword
Examples from the Corpus
four-letter word"Diet" has become a four-letter word in the commercial weight-loss business; now they're called "foodplans."The best four-letter word in the world.No four-letter words, please - this is a family show.
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