With this type of wager, you are selecting whether the two teams will score more or less than a specified number of goals. If exactly that number of goals is scored, the bet is a push and your stake is returned.
For example: the point total for the upcoming game between the Toronto Maple Leafs and the Dallas Stars is set at 6 goals. If you bet the over, it wins if 7 or more goals are scored and loses if 5 or fewer are scored. If exactly 6 goals are scored, the wager is a push, and your stake is returned.
If the push leg was part of a parlay, that leg is removed, and the overall price of the parlay is recalculated without it.
For more information, see the General Rules, Tickets & Wagers article.