I dont get thi cross over thing could somebody explain it?

Daniel E dan.....if the third place team in one division has win-loss record that is worse than the fourth place team in the other division then the third place team is eliminated from the playoffs and the fourth place team 'crosses over' to the other division to play the second place team in that division's's that?.....

K Thanks

Note how RedandWhite said "has win-loss record that is worse than..." because if the third place team and the fourth one of the other division have the same win-loss record, there is no tiebreaker. The third place team keeps its playoff spot.