wildcat
adjective
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(of a mine or oil well) drilled speculatively in an area not known to be productive“drilling there would be strictly a wildcat operation”
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without official authorizationunofficially
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outside the bounds of legitimate or ethical business practices“wildcat currency issued by irresponsible banks”
noun
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any small or medium-sized cat resembling the domestic cat and living in the wild
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an exploratory oil well drilled in land not known to be an oil fieldwildcat well
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a cruelly rapacious personbeast