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Done or ventured individually, apart from ordinary corporate structures: a wildcat well/ a wildcat cab (1883+)noun
To drill for oil, esp without strong corporate and financial backing (1877+)
[fr the independent behavior of feral felines; in the 1840s a Western bank issued banknotes picturing a wildcat and then suspended payment; in early 1900s show business, to wild-cat meant to book a theater tour day-by-day]