best play, strongest means, most effective device, trick; see agent 1, device 2, strength 1.
"trump card." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/trump-card>.
trump card. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/trump-card
Something, especially something held in reserve, that gives one a decisive advantage:
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