the joker in the pack

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the joker in the pack

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 pack. The joker in the pack in this game will be the performance of the bench players.
See also: joker, pack

the joker in the pack

mainly BRITISH
If something or someone is the joker in the pack, they are different from the other things or people in a situation and no one knows how they will behave. He's seen very much as the wild boy of Italian fashion — the joker in the pack. Note: The joker in a pack of playing cards is the card which does not belong to any of the four suits.
See also: joker, pack