"Proposition bets" refers to bets made on specific events or outcomes during a game or event that are not directly related to the final outcome. These bets are usually fun and exciting but often have low chances of winning. Full definition
Because of their creativity and willingness to set exotic odds, you will always find a vast selection of proposition bets and futures. (sportsinsights.com)
These are known as proposition bets, or props. (sbnation.com)
Before the start of the season, we published an article that looked at a number of season - long proposition bets that were available across the sports betting marketplace. (sportsinsights.com)