Having too many people or things in a space, making it uncomfortably full.
From 'over-' (too much) + 'crowded' (filled with people). 'Crowd' comes from Old English 'crudan' meaning to push. The prefix 'over-' has been used since Old English to mean excess.
Overcrowding is a problem that dates back to ancient cities—Rome's tenement buildings were so packed that fires would spread between them, and building codes were created because of disasters, not kindness.
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