What it means
A wild card is the person, factor, or situation nobody can read properly. They might save the day, blow the whole thing sideways, or do something so out of pocket everyone has to regroup. It comes from card games, where a wild card can stand in for others, so in real life it's the unpredictable bit in the mix.
Usage examples
"He is the wild card of the negotiation, charming one minute and storming out the next, so plan for anything."
"Nobody knows how he'll vote, he's the wild-card on the committee."
"The weather is the wild-card for Saturday's match, could go either way."
"Don't write him off yet, he's the wild card in this whole race and he could still nick it."
"We've sorted the budget, the venue, the speakers and all that. The wild card now is whether Zara actually turns up on time."
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Where it comes from
This one really does come from card games. A wild card is a card that can substitute for another card, which gives it a slippery, anything-could-happen energy. From there it spread into everyday English for people, teams, weather, politics, or any factor that could swing things in a surprising direction.
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