Alternative form of whistle-blower

(idiomatic, usually with "on") To disclose information to the public or to appropriate authorities concerning the illegal or socially harmful actions of a person or group, especially a corporation or government agency.

One who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer.

present participle and gerund of whistle

A shrill, breathy sound; a whistle.

(US, regional) The woodchuck.

(idiomatic, Southern US) To engage in idle conversational fantasies.

The disclosure to the public or to authorities, such as by an employee, of wrongdoing.

A tin whistle.

A high-pitched whistle, inaudible to humans, used to train dogs. / (figuratively) That which is understood only by a narrow demographic.