Idiom (pinyin: chéngyǔ, English: idiom) is a stereotype in Chinese vocabulary.
Idiom is a major feature of traditional culture in China, which has a fixed structure and a fixed sentence, indicating a certain meaning. It is applied to a sentence as a whole, with subject, object, attribute and other components.
A large part of idioms are passed down from ancient times and represent a story or allusion. Some idioms are just a miniature sentence.
Idiom is a ready-made word, similar to idioms and proverbs, but slightly different. Idioms, everyone says they have become words, and so do idioms.
Idioms are mostly four-character, and some are three-character, five-character or even more than seven-character.