What is the meaning of swarm?

noun

• A moving crowd.
  • synonyms: drove, horde
• A group of many things in the air or on the ground.
  • usage: "a swarm of insects obscured the light"; "clouds of blossoms"; "it discharged a cloud of spores"
  • synonyms: cloud

verb

• Be teeming, be abuzz.
  • usage: "The garden was swarming with bees"; "The plaza is teeming with undercover policemen"; "her mind pullulated with worries"
  • synonyms: teem, pullulate
• Move in large numbers.
  • usage: "people were pouring out of the theater"; "beggars pullulated in the plaza"
  • synonyms: pour, stream, teem, pullulate