an ace up one's sleeve

idiom

Definition of an ace up one's sleeve

: a powerful and often secret weapon, advantage, etc., that can be used if it is needed The mayor's popularity among elderly voters gives him an ace up his sleeve for the coming election.

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“An ace up one's sleeve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/an%20ace%20up%20one%27s%20sleeve. Accessed 14 May. 2021.

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