It refers to the act of acknowledging and revealing one's own wrongdoing or involvement in a crime. It can also be used more broadly to describe the act of openly admitting to any personal truth or fault.
Here are some examples of how "jibai" is used:
* 警察に自白した。(Keisatsu ni jibai shita.) - He confessed to the police.
* 彼は自分の過ちを自白した。(Kare wa jibun no ayamachi o jibai shita.) - He confessed to his mistake.
* 彼女は自分が間違っていたと自白した。(Kanojo wa jibun ga machigatte ita to jibai shita.) - She confessed that she was wrong.
Note: The term "jibai" is often used in legal contexts, but it can also be used in everyday conversations.