have an ace up one's sleeve
The phrase "have an ace up one’s sleeve" is an idiomatic expression that means to possess a secret or hidden advantage that can be used to gain an edge or win a situation. It originates from card games, specifically poker, where having an ace concealed in one's sleeve could be used to deceive opponents and achieve victory. Figuratively, it implies being prepared with a surprise or advantage in a given situation to ensure success.
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