noun
a person who searches out and publicly exposes real or apparent misconduct of a prominent individual or business
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The investigative journalist was known as a muckraker for her relentless pursuit of uncovering corruption.
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I heard that gossip columnist is a real muckraker, always digging up dirt on celebrities.
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Don't listen to him, he's just a muckraker spreading rumors.
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In literature, the author portrayed the protagonist as a muckraker, revealing the hidden truths of society.