A cut made downward, especially in geology or engineering, or the erosive process where water cuts deeper into the earth.
Combination of 'down' and 'cut,' used primarily in geological and hydrological contexts since the 19th century. Describes the vertical cutting action of rivers and streams wearing away rock.
Rivers don't just meander side to side—they also 'downcut,' carving deeper and deeper into bedrock over millennia. This geological process created some of Earth's most dramatic canyons, and geologists needed a precise term for this specific kind of vertical erosion.
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