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turn up trumps

End well, succeed, as in Some brief courtships and hasty marriages turn up trumps. This expression alludes to card games in which trump cards are superior to cards of other suits. [Late 1700s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.