Héhuǒrén yīnwèi lìyì fēnpèi bùgōng ér fǎnmù-chéngchóu.
The partners fell out bitterly over unfair profit-sharing.
Tips
history
Found in 《红楼梦》 Chapter 57: 怜新弃旧,反目成仇的多着呢 - 'plenty of people fall in love anew, cast off the old, and turn into enemies.' The phrase was already common in Qing vernacular.
memory
反目 literally 'eyes turned against' - from 《周易》 imagery of eyes no longer meeting. 成仇 = 'become enemies.' The sequence: friendship/family, turn eyes against each other, become enemies.