If a team is -6 in BetMGM’s NFL betting odds, they're favored by six points. Their opponent, the underdog, would be +6.
To cover the spread (-6), the favorite must win by at least seven points. If they win by exactly six points, it would be a push.
To cover the spread (+6), the underdog must lose by five or less points, win the game, or tie (after overtime). If they lose by exactly six points, it's a push.
Overtime is included in the final score that determines if the team covers the spread.