Gathering together in large numbers in a tight space, causing things or people to be squeezed close together.
From Middle English 'crouden' or 'crude' (to push). 'Crowd' entered English from uncertain origins around the 1500s. The '-ing' form indicates the continuous action.
Scientists have found that crowding actually changes animal behavior—fish in crowded tanks become more aggressive, and mice in crowded cages show symptoms similar to depression!
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