Chengyu (traditional Chinese: 成語; simplified Chinese: 成语; pinyin: chéngyǔ, are a type of traditional Chinese idiomatic expression, most of which consist of four characters. Chengyu is widely used in Classical Chinese and is still common in vernacular Chinese writing and in the spoken language today. According to the most stringent definition, there are about 5,000 chéngyǔ in the Chinese language.



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