noun
a person who pretends to give an impartial endorsement of something in which they have an interest, typically for promotional purposes
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The company hired a shill to promote their new product during the launch event.
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I heard that guy is just a shill for that brand, he always talks about their products.
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Don't trust that shill, he's just trying to sell you something you don't need.
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Her constant praise for the company made her seem like a shill for their agenda.