blow the whistle

To "blow the whistle" means to expose or report wrongdoing, typically within an organization or group, in order to bring attention to unethical, illegal, or harmful activities. It involves revealing confidential or inside information to authorities, the media, or the public, with the intent of uncovering and stopping the wrongdoing. This phrase is often used in cases of corporate corruption, fraud, abuse, negligence, or any situation where individuals feel compelled to reveal misconduct in the interest of justice or public safety.