what does watershed moment mean

A "watershed moment" is an important turning point or a dividing line in time when things change so significantly that things will never be the same again. It marks a moment or event after which the direction or course of events shifts decisively, representing a big change in how people think or act. The term comes from the geographic meaning of "watershed," which is a land area dividing the flow of rivers into different directions, symbolizing a critical juncture where something takes a new path from that point onward.