1. Official unofficial history, a Chinese idiom, pinyin is bàiguānyěshǐ, which is generally referred to as novels and writings that record obscure anecdotes.

2. The origin of the idiom: History of Arts and Literature in Han Dynasty: "Novelists flow because of officials, gossip in the streets, and hearsay."

3. Synonyms are official novels and anecdotes.

4. History of antonym official revision.