So, when you place an "Over 1.5" bet, you are essentially betting that there will be at least two goals or points scored in the match. If the final score of the game is 2-0, 2-1, 3-0, or any other combination where the total goals or points are two or more, your bet wins.
Specifically, over 1.5 refers to a bet on the total number of goals scored in a match. In soccer, for example, if you place an over 1.5 bet, it means you are predicting that there will be two or more goals scored in the match.