noun

watershed

watershed, turning point, divide

The river's watershed covers a huge area.

The river's watershed covers a huge area.

Her invention was a watershed in the industry.

Her invention was a watershed in the industry.

((a watershed)) a geographical area The Amazon watershed is the largest in the world.

((a watershed in sth.)) a turning point in something The discovery was a watershed in medical history.

Synonyms: turning point, milestone, divide (geographical), catchment area (geographical)

From 'water' + 'shed' (in the sense of a divide or ridge). Water 'sheds' or flows down from this high point.

Picture a mountain ridge (the 'shed') where water flows to different sides. This is a clear dividing line, just as a figurative watershed is a dividing point in time.

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