Relating to or causing congestion, especially in medical contexts where it refers to an abnormal accumulation of fluid, blood, or traffic in a space where it shouldn't be.
From Latin 'congestus,' past participle of 'congerere' (to heap together), from 'con-' (together) plus 'gerere' (to carry). The medical meaning developed in the 18th-19th centuries as physicians understood fluid dynamics in disease.
Congestive heart failure is one of the leading causes of hospitalization in elderly people because when the heart weakens, blood backs up into the lungs and tissues—it's not that the heart stops, but that fluid accumulates everywhere it shouldn't, making it progressively harder to breathe.
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