an ace up one's sleeve
idiom
: 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 26 Apr. 2024.
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