The characters literally translate to: “Grievance for grievance, mutually retaliating—when will it end?” The structure paints a vivid picture of an unending, destructive loop.
This proverb is formal in origin but is widely understood and can be used in various situations to sound wise and contemplative.
The connotation is almost always somber and pleading, urging a stop to negativity. It's rarely used for trivial matters; it's reserved for serious, damaging cycles of conflict.