A hidden advantage or resource that you can use when needed.
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A secret advantage or resource kept in reserve until the right moment.
An ace in the hole is something you hold back deliberately and use at a decisive moment to gain an edge.
It implies careful planning and an element of surprise.
"Up Your Sleeve"
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A trick or plan kept hidden, used more casually and broadly
"Wild Card"
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An unpredictable element whose outcome is unknown, not a strategic reserve
"Ace in the Hole"
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A secret advantage deliberately saved for a decisive moment