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Phrase(s): play with a full deck
1. Lit. to play cards with a complete deck, containing all the cards. • Are we playing with a full deck or did some card drop on the floor? I haven’t seen the three of hearts all evening! 2. Fig. to operate as if one were mentally sound. (Usually in the negative. One cannot play cards properly with a partial deck.) • That guy’s not playing with a full deck. • Look sharp, you dummies! Pretend you are playing with a full deck.
McGrawhill's American Idioms And Phrasal Verbs