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.
1.3 A series of similar-sized earthquakes occurring together, typically near a volcano.
1.4 Astronomy A large number of minor celestial objects occurring together in space, especially a dense shower of meteors.
1 (of flying insects) move in or form a swarm.
1.1 (of honeybees, ants, or termites) issue from the nest in large numbers in order to mate and found new colonies.
2 no object, with adverbial Move somewhere in large numbers.
2.1 swarm with – Be crowded or overrun with (moving people or things)
Old English swearm (noun), of Germanic origin; related to German Schwarm, probably also to the base of Sanskrit svarati ‘it sounds’.
Surrounded by the swarm, Bob did not enjoy his cooling drink.