Questions on buying Toyotas/Potential Car Salesman Shenanigans

[train.]

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Once you drive it off the forecourt, you have the aces.

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What does this mean?

From context it seems like, "Once you drive the car from the dealership, you're stuck with it," but I've never heard the "aces" part used that way.

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I think he meant the dealership doesn't have the most leverage here, she does. She holds the upper hand, aces.