I feel Modifying betting lines equates to adjusting the odds or the point spread of a game to encourage betting on the underdog or the less popular side. This strategy is used by sportsbooks to ensure that they can balance the amount of money wagered on each side of a game and reduce their financial risks. By modifying the betting lines, sportsbooks try to encourage bettors to place more wagers on the less popular side and lessen the amount of money bet on the more popular side, thus evening out their potential losses.