A wild card
Meaning
A person or thing whose influence or nature is unpredictable and could significantly alter a situation.
Origin
In the late 19th-century American card rooms, a thrilling new element began to appear in games like poker: the "wild card." This special card, often a joker or a deuce, could be declared by the player to represent any card they wished, turning a losing hand into a winning one or completely changing the dynamics of the game. It introduced an exhilarating level of unpredictability, capable of swinging fortunes in an instant. From the green felt of the card table, this potent concept quickly entered the broader lexicon, becoming the perfect shorthand for any person or factor whose surprising and unpredictable nature holds the power to dramatically alter any outcome.
Examples
- The new player for the basketball team is a bit of a wild card; his performance is often brilliant but inconsistent.
- While the budget seemed set, a sudden change in material costs introduced a wild card that we hadn't anticipated.