Sweepstake/ˈswiːpsteɪk/ Definition 1 of 3Pro Tip 1/3Guessing Game Sweepstake participants guess outcomes and not skill-based like contests. The office sweepstake had everyone guessing the baby's due date. Pro Tip 2/3Group Fund Money for the prize comes from participants, not an external sponsor. Everyone chipped in $5 for the Oscar night sweepstake. Pro Tip 3/3Collective Excitement Often used to build camaraderie in groups anticipating a shared event. The rugby club's sweepstake added thrill to the championship games.