It would be hard to get all the sports betting terms into one post.
Over/under is a bet made on a total amount of points in a game. Basically you are betting that the total score will be more or less than a number.
The vig is like interest on a loan. If you borrow money from a loan shark you might have a weekly vig that you have to pay along with the principal.
The spread is a betting function to even out the odds of a winner. If one team is likely to win, or is getting a lot more money bet at it, the spread will even the odds so more people bet on the other team. A spread of -7 in football for example would mean that if you bet on the team they would have to win the game by more than 7 points for you to win the bet.
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