To put it all on black means to risk everything on a single choice or plan. It describes when someone commits all their money, effort, or hopes to one outcome that isn't guaranteed.
The expression comes from the game of roulette. A player can bet on the color black, and saying someone puts everything on black suggests risking all their chips on one spin of the wheel.
The expression comes from the game of roulette. A player can bet on the color black, and saying someone puts everything on black suggests risking all their chips on one spin of the wheel.
He decided to put it all on black and put all his savings into the new restaurant.