have/keep (something) up one's sleeve

idiom

Definition of have/keep (something) up one's sleeve

informal
: to have/keep a secret method, trick, etc., that one can use when it is needed The coach always keeps a few tricks up his sleeve. They still have some surprises up their sleeves.

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“Have/keep (something) up one's sleeve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/have%2Fkeep%20%28something%29%20up%20one%27s%20sleeve. Accessed 3 Aug. 2020.

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