1 [always + adverb/preposition] if people swarm somewhere, they go there as a large, uncontrolled crowd :
Photographers were swarming around the princess.
Photographers were swarming around the princess.2HBI if bees swarm, they leave a hive (=place where they live) in a large group to look for another home
swarm with somebody/something
phrasal verb
The museum was swarming with tourists.
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