In a manner that is crowded; with many people or things packed closely together.
From 'crowded' (past participle of 'crowd,' from Old English 'crudan' meaning to push or press) + '-ly' (adverb suffix). This formation became common in 18th-century English for describing congested conditions.
This adverb is rarely used today, but it captures a 300-year-old way of describing the claustrophobic feeling of crowded cities—a concern that became especially acute during the Industrial Revolution.
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