Definition of four-letter word in English:

four-letter word

Syllabification: four-let·ter word

noun

Any of several short words referring to sexual or excretory functions, regarded as coarse or offensive.
More example sentences
  • It all comes down to an obscene four-letter word.
  • However, Barbara is absolutely correct in summarizing the natural selection theories of Charles Darwin (whose name has become somewhat of a four-letter word in some circles) as inarguable.
  • I uttered a four-letter word and continued thrashing along, sweating like a pig and gasping.

Definition of four-letter word in:

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Word of the day vituperate
Pronunciation: vɪˈtjuːpəreɪt
verb
blame or insult (someone) in strong language...