swarm Definition in Cambridge British English Dictionary
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Definition of "swarm" - British English Dictionary

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swarmnoun

uk   /swɔːm/  us   /swɔːrm/
[C] a large group of insects all moving together: a swarm of bees/wasps/ants/locusts The dead sheep was covered with swarms of flies. [C, + sing/pl verb] a large group of people all moving together: A swarm of/Swarms of journalists followed the film star's car.

swarmverb [I]

uk   /swɔːm/  us   /swɔːrm/
When insects swarm, they come together in a large group. When people swarm somewhere, they move there in a large group or in large numbers: After the game, thousands of fans swarmed onto the pitch.
Phrasal verbs
(Definition of swarm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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