Noun
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a group of many things in the air or on the ground
"a swarm of insects obscured the light"
"clouds of blossoms"
"it discharged a cloud of spores"
-
a moving crowd
Verb
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move in large numbers
"people were pouring out of the theater"
"beggars pullulated in the plaza"
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be teeming, be abuzz
"The garden was swarming with bees"
"The plaza is teeming with undercover policemen"
"her mind pullulated with worries"