wild card
ˈwild ˌcard
noun [countable]
1. 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
4. technical a symbol that can represent any letter in some computer instructions
ˈwild ˌcard
noun [countable]1. 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
4. technical a symbol that can represent any letter in some computer instructions