Meaning of “turn/come up trumps” in the English Dictionary

british dictionary

"turn/come up trumps" in British English

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turn/come up trumps

UK

to complete an activity successfully or to produce a good result, especially when you were not expected to:

John's uncle came up trumps, finding us a place to stay at the last minute.

(Definition of “turn/come up trumps” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)