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wild card (n.)

1950 in figurative sense, from literal use in certain forms of poker (1941), from wild (adj.) + card (n.1). The phrase was used occasionally c. 1900 in British and Irish writing to mean "drinking, free-spirited man."

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Definitions of wild card

wild card (n.)
an unpredictable factor;
the weather was a wild card
wild card (n.)
a playing card whose value can be determined by the person who holds it;
From wordnet.princeton.edu