Fat-cat meaning

A person who is rich and influential.
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A wealthy supporter of a political campaign.
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A wealthy, influential person, specif. one who is a heavy contributor to a political party or campaign.
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(slang) A rich person who contributes to a political campaign.
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(slang) Any affluent person who is perceived to have profited from the labour of others.
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Origin of fat-cat

By the middle of the 20th century the term was being applied more widely to any wealthy individual.