Dictionary

four–letter word

noun

: an offensive word and especially an offensive word that has four letters

: a word, subject, or idea that is disliked by some people

Full Definition of FOUR-LETTER WORD

:  any of a group of vulgar or obscene words typically made up of four letters; broadly :  a taboo word or topic <tax is a four-letter word to him>

First Known Use of FOUR-LETTER WORD

1897

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