If a team is -4 in NFL betting at BetMGM, they're favored by four points. Their opponent, the underdog, would be +4.
To cover the spread (-4), the favorite must win by at least five points. If they win by exactly four points, it would be a push.
To cover the spread (+4), the underdog must lose the game by three or less points, win the game, or tie (after overtime). If they lose by exactly four points, it's a push.
Overtime is included in the final score that determines if the team covers the spread.