A wild card is a playing card in a deck that can be used to represent any other card. The term 'wild card' is often used in other contexts to refer to something that can be used as a substitute for something else. In the context of a crossword puzzle, the solutions DEUCE, JOKER, and CUTUP all refer to wild cards. DEUCE is a slang term for the two of any suit, which is often used as a wild card in some card games. JOKER is a card found in some decks that is usually used as a wild card. CUTUP is a slang term for a person who is mischievous or disruptive, and can also be used to refer to a wild card.