中文翻译与英英解释

四字母忌讳词〔与性或大便有关，通常由四个字母构成的单音节的词，一般都忌讳不说〕。

four-letter:    adj. 〔美国〕庸俗的，下流的，黄色的。

word:    n. 1.单词；〔pl.〕歌词，台词。 2.〔常 pl. ...

any of several short English words (often having 4 letters) generally regarded as obscene or offensive
同义词：four-letter Anglo-Saxon word,

The phrase four-letter word refers to a set of English-language words written with four letters which are considered profane, including common popular or slang terms for excretory functions, sexual activity and genitalia, and (depending on the listener/reader) sometimes also certain terms relating to Hell and/or damnation when used outside their original religious context(s), and/or slurs. The "four-letter" claim refers to the fact that a large number of English "swear words" are incidentally four-character monosyllables.