A "major rift" refers to a significant disagreement or division between individuals, groups, or organizations. It describes a strong and noticeable break or separation where there is a lack of agreement or harmony. Full definition
Arsenal dropped tamely away from contention in the Premier League during the turbulent first half of the season, when Wenger's gamble on keeping Alexis Sanchez back - fired and it caused major rifts in the dressing room and on the pitch. (justarsenal.com)
Israel is becoming more isolated by the day and needs critical friends to save it from its current government's actions which have created major rifts with Turkey and Egypt. (politics.co.uk)