Double or nothing
The term "double or nothing" refers to a feature found in some slots that gives you the option of doubling your winnings or losing outright. It is usually offered after a successful spin or a winning hand, and involves betting on (i.e. guessing) the suit of a hidden card. This essentially gives you the choice to try doubling your winnings by guessing the right color or losing everything you just won entirely should you guess the wrong color.