Meaning of “have a card up your sleeve” in the English Dictionary

british dictionary

"have a card up your sleeve" in British English

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have a card up your sleeve

to have an advantage that other people do not know about:

England have definitely been the weaker side, but I think they've still got one or two cards up their sleeve.

(Definition of “have a card up your sleeve” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)