have got an ace up (one's) sleeve

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have got an ace up (one's) sleeve

To have a secret plan, idea, or advantage that can be utilized if and when it is required. A reference to cheating at a card game by hiding a favorable card up one's sleeve. I've got an ace up my sleeve for this race—my stamina. The other runners don't stand a chance! I hear that the defense attorney has got an ace up her sleeve—a new eye-witness.
See also: ace, have, sleeve, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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