If the spread is set at +7, the underdog must either win the game outright or lose by fewer than seven points in order to cover. For the favorite to cover, they must win by more than seven points.
Odds accompanied with a negative sign (-) indicate that this is the favorite and this outcome will have a higher chance of winning compared to the underdog, however underdogs will yield a higher profit if they win. The implied win probability of -400 odds is 80.00%.