To fill or crowd something so full that it becomes blocked or difficult to move through.
From Latin congestus, past participle of congerere 'to bring together,' from con- 'together' and gerere 'to carry.' It originally meant 'to heap up' and evolved to mean 'to accumulate or crowd.'
During rush hour, traffic congestus—medieval Latin for 'heaped together'—becomes a concrete traffic jam; the same word root describes your lungs filling with fluid during a cold!
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