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have a card up your sleeve

Definition

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.Plotting and trappingPlanning, expecting and arrangingCheating and trickingPlans and arrangements
(Definition of have a card up your sleeve from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)