sweepstake
(also infml 口语作 sweep) n
(a) type of gambling in which all the money bet on the result of a contest is divided among those who by chance have selected or been given tickets corresponding to the eventual winner(s) of the contest 赌金全赢制(胜者可获全部赌金者).
(b) horse-race on which money is bet in this way 实行赌金全赢制的赛马.