A curve or line that bends downward, especially used in technical or statistical graphs.
Compound of 'down' and 'curve,' formed in modern English (19th-20th century) to describe directional change in charts, graphs, and statistics. Originally used in mathematics and science to describe negative slopes or declining trends.
Engineers and statisticians needed a quick word to describe trends going the wrong way on a graph, so 'downcurve' was born. It's one of many technical compounds created during the Industrial Revolution when people needed precise vocabulary for measuring progress—or regression.
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