Definitions for muckrakeˈmʌkˌreɪk
Random House Webster's College Dictionary
to search for and expose corruption, scandal, or the like, esp. in politics.
Origin of muckrake:
Amer.; popularized by T. Roosevelt in 1906, in a speech alluding to the Man with the Muckrake in Bunyan's Pilgrim's Progress
explore and expose misconduct and scandals concerning public figures
"This reporter was well-known for his muckraking"
to search for and expose corruption or scandal especially as done by a journalist.
Origin: muck + rake