noun
secret information; private message
Refers to information or messages that are not public, often used in contexts like internal communications or confidential tips.
彼は私報を基に記事を書いた。
He wrote an article based on secret information.
その私報は社内だけに共有された。
The private message was shared only within the company.
Compound of 私 (private) and 報 (report, information). The exact historical derivation is uncertain, but the meaning is transparent from its components.