A watershed is an area of land where all the rain and streams drain into the same river, lake, or ocean; it can also mean a turning point in history.
“Watershed” joins “water” with “shed,” an old word meaning “to divide or separate,” referring to the line that splits where water flows. Over time, people used it metaphorically for events that divide one era from another.
On a map, a watershed is like a giant bowl that funnels water to a single exit point, even if the bowl has mountains for edges. When we say “a watershed moment,” we’re borrowing that image to talk about events that change the direction of history.
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