Definition of trump card Trump card

We found 3 definitions of trump card from 2 different sources.

What does trump card mean?

Noun
trump card - a playing card in the suit that has been declared trumps; "the ace of trumps is a sure winner"
		trump
		playing card one of a pack of cards that are used to play card games

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trump card (Noun)
A playing card , of the trump suite that is held in reserve until needed to win a trick.
trump card (Noun)
Something used to obtain an advantage, sometimes unscrupulously.