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English definition of “wild card”

wild card

noun [C] (NOT KNOWN)   
someone or something whose behaviour is sometimes unexpected: The wild card in this election is the Green Party - no one knows exactly how much support they will get.UncertaintyHesitatingAchievableUnknown and unfamiliar
(Definition of wild card noun (NOT KNOWN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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