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English definition of “trump card”

trump card

noun [C usually singular] uk   us  
an advantage that makes you more likely to succeed than other people, especially something that other people do not know about: Anthea was about to play her trump card - without her signature none of the money could be released.Advantage and disadvantage
(Definition of trump card from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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