wild card

American  

[wahyld-kahrd] / ˈwaɪldˌkɑrd /

Or wildcard

noun

1. Cards. a card having its value decided by the wishes of the players.

2. a determining or important person or thing whose qualities are unknown, indeterminate, or unpredictable.

   In a sailboat race the weather is the wild card.

3. Sports. an unranked or unproven player or team that is allowed to enter a tournament after regularly qualifying competitors have been selected.

   The committee added several retired champions as wild cards in the tennis championships.

4. Digital Technology. a symbol in a search parameter, usually the asterisk or question mark, that will retrieve all results for another character or other characters in its position.

   The file search is case-sensitive, and wildcards are not supported.

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wild card British  

noun

1. See wild

2. sport a player or team that has not qualified for a competition but is allowed to take part, at the organizers' discretion, after all the regular places have been taken

3. an unpredictable element in a situation

4. computing a symbol that can represent any character or group of characters, as in a filename

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wild card Idioms  

1. An unpredictable person or event, as in Don't count on his support—he's a wild card, or A traffic jam? That's a wild card we didn't expect. This expression comes from card games, especially poker, where it refers to a card that can stand for any rank chosen by the player who holds it. The term was adopted in sports for an additional player or team chosen to take part in a contest after the regular places have been taken. It is also used in computer terminology for a symbol that stands for one or more characters in searches for files that share a common specification. Its figurative use dates from the mid-1900s.

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Etymology

Origin of wild card

First recorded in 1530–40

Example Sentences

The U.S. trade deficit and the production of inventories —or unsold goods — are also wild cards that could exaggerate ups and downs in fourth-quarter GDP.

From MarketWatch

The wild card now is the Supreme Court’s decision on the legality of certain tariffs, which could arrive as early as Friday.

From Barron's

Trujillo, the Democratic consultant, said the other wild card is Adam Miller, the tech entrepreneur who has waded into the fight against homelessness.

From Los Angeles Times

But there are plenty of wild cards ahead, as Ullrich and others are quick to acknowledge.

From BBC

The big wild card in 2026 is how a top-heavy market reacts to AI-inspired volatility, from fears that the bubble will burst to warnings that new technologies could upend entire industries.

From The Wall Street Journal