swarm
/swɔːm/
noun
1 A large or dense group of flying insects.
1.1 A large number of honeybees that leave a hive en masse with a newly fertilized queen in order to establish a new colony.
1.2 a swarm/swarms of - A large number of people or things.
verb
[no object]
(of flying insects) move in or form a swarm.
Origin
Old English swearm (noun), of Germanic origin
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Surrounded by the swarm, Bob did not enjoy his cooling drink.