wild card

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wild card • n. a playing card that can have any value, suit, color, or other property in a game at the discretion of the player holding it. ∎  a person or thing whose influence is unpredictable or whose qualities are uncertain. ∎  Comput. a character that will match any character or sequence of characters in a search. ∎  an opportunity to enter a sports competition without having to take part in qualifying matches or be ranked at a particular level. ∎  a player or team given such an opportunity.