(US) One who investigates and exposes issues of corruption that often violate widely held values; e.g. one who exposes political corruption or the poor conditions in prisons.

plural of muckraker

present participle of muckrake

A rake for scraping up dung.

(intransitive) To search for and expose corruption or scandal, especially as a form of investigative journalism.

simple past tense and past participle of muckrake

Third-person singular simple present indicative form of muckrake