trump

noun
noun: trump; plural noun: trumps
1.
(in bridge, whist, and similar card games) a playing card of the suit chosen to rank above the others, which can win a trick where a card of a different suit has been led.

the suit having the rank above the others in a particular hand.
"the ace of trumps"

(in a tarot pack) any of a special suit of 22 cards depicting symbolic and typical figures and scenes.

a valuable resource that may be used, especially as a surprise, in order to gain an advantage.
noun: trump card; plural noun: trump cards
"in this month General Haig decided to play his trump card: the tank"

informal-dated
a helpful or admirable person.

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