Large groups of insects or animals moving together, or crowds of people gathered in one place.
From Old English 'sweorm,' related to Germanic words meaning 'to turn or swirl.' The word originally described bees leaving a hive together, then expanded to other crowded groups.
When honeybees swarm, they're actually looking for a new home with a queen—what looks chaotic is actually a highly organized process with scout bees leading the way and drones protecting the queen!
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