Longman Dictionary of Contemporary English homepage

wild card

noun
     
Related topics: Cards, Computers
wild card [countable]
1DGC a playing card that can represent any other card
2 someone whose behaviour or effect on a situation is difficult to guess
3 a player who is a wild card or who is given a wild card is chosen for a competition although they have not previously done well enough to take part
4TD technicalTD a symbol that can represent any letter in some computer instructions

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