a joker in the pack

a joker in the pack

Someone or something that is unpredictable; a wild card. There are a few unpredictable elements here, but the weather will be a real joker in the pack. The new quarterback has proven to be a joker in the pack for this team. They're looking for a steady, reliable candidate for the position, not a joker in the pack.
See also: joker, pack
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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