To back an outcome is to open a bet that has an expectation of a positive outcome for the proposition of the event. For example, if the bettor backs Team A to win a football match then they expect Team A to win. Backing in Sports Trading the same as going long in financial trading. Depending on the characteristics of the bet, it is possible to back a negative outcome (e.g. a team to get relegated or lose). Negative bets are more commonly achieved in Sports Trading using a Lay bet, however. Contrast to back or backing with to Lay or laying.