a/your trump card

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trump card

1. A designated card in some card games that ranks above all others. The only way I can win this hand is if I get the trump card.
2. A resource used to gain an advantage over others, often by being held and then used at an opportune time. I have a feeling the prosecution still hasn't played their trump card in this trial—I expect a big revelation during tomorrow's testimony.
See also: card, trump
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

trump card

A key resource to gain an advantage at the opportune moment, as in That surprise witness was the defense's trump card, or She played her trump card, announcing that the Senator would speak. This expression transfers the trump card of games such as bridge, which can win over a card of another suit, to other kinds of advantage. [Early 1800s]
See also: card, trump
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

a/your ˈtrump card

something 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: Many schools use small classes as their trump card in marketing campaigns.He waited until the last minute to play his trump card and tell them about his plans to cut costs.
In some card games, one of the four suits is chosen to have a higher value than the others. The cards in that suit are trump cards.
See also: card, trump
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
It expresses a skepticism about political news that leads us to mistrust politicians' statements and to see their game as one that uses thousands of human lives as a trump card.
For those in the dark, a trump card can be used franchise to buy back a player they hadn't retained at the start of the auction.