sweepstake
noun [ C ] uk/ˈswiːp.steɪk/ us/ˈswiːp.steɪk/ (informal sweep); (US sweepstakes, sweeps)
（通常指赛马的）赌金全赢制
a type of gambling, often on a horse race, in which people pay a small amount of money and choose a particular horse, team, etc. The person who chooses the winning horse, team, etc. receives all the money paid by everyone else.