Specifically, "Over 2" means that the sportsbook is predicting that there will be more than two total goals scored in the game. So, if you were to place a bet on the "Over 2" outcome, you would win if there are three or more goals scored in the game, and lose if there are one or fewer goals scored.
OVER 2.0 GOALS DEFINITION\n\n When betting on the Over market you need the total goals of a game to exceed 2.0 for your bet to win. If the result total of the game is exactly 2.0 goals it is known as a push, meaning the total bet results in no winner or loser.