the joker in the deck

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the joker in the deck

Someone or something that is unpredictable; a wild card. There are a few unpredictable elements here, but the weather is the real joker in the deck. The joker in the deck in this game will be the new quarterback, who is looking to prove himself out on the field.
See also: deck, joker
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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