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four-letter word

noun [C]
 
 
/ˌfɔːlet.əˈwɜːd/ US  /ˌfɔː.let̬.ɚˈwɝːd/

Definition

a short word that is considered to be extremely rude and offensive: Four-letter words are often edited out of films before they are shown on television.Swearing and blasphemy
(Definition of four-letter word noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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