Definition of trump card noun from the Oxford Advanced Learner's Dictionary

     

    trump card

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1= trump
  2. 2something that gives you an advantage over other people, especially when they do not know what it is and you are able to use it to surprise them He was able to get what he wanted without having to play his trump card. Many private schools use small classes as their trump card in marketing campaigns.
See the Oxford Advanced American Dictionary entry: trump card

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