"Whistle-blower" Natural Recordings by Native Speakers
A person who informs on a person or organization considered to be violating the law, often doing so within an organization, or to the general public, rather than through proper official channels. Example: The journalist was investigated for poising as a whistle-blower to get the story.
A whistle is a high-pitched sound made by forcing air through a small opening in order to produce a loud, shrill noise. It is often used to get someone's attention or to signal something. A whistle can also refer to the act of making this sound, or a device used to produce it.