have an ace up (one's) sleeve

have 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 have 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 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.

have an ace up your sleeve

have an effective resource or piece of information kept hidden until it is necessary to use it; have a secret advantage.
The ace is the highest playing card in its suit in many card games, so a cheating player might well hide one to use against an unwary opponent. A North American variant is an ace in the hole . The next two idioms are also based on this meaning of ace .
See also: ace, have, sleeve, up
Farlex Partner Idioms Dictionary © Farlex 2017

have an ˌace/a ˌtrick up your ˈsleeve

(British English) (American English have an ˌace in the ˈhole) (informal) have an idea or plan which you keep secret and can use if you need to (especially in order to gain an advantage over somebody): They think they’ve won the contract but we’ve still got a couple of aces up our sleeve.
See also: ace, have, sleeve, trick, up
Farlex Partner Idioms Dictionary © Farlex 2017

have an ace up one’s sleeve

tv. to have something useful in reserve; to have a special trick available. (Have got can replace have.) I still have an ace up my sleeve that you don’t know about.
See also: ace, have, sleeve, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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