noun

• (computing) A group of nodes sharing the same torrent in a BitTorrent network.
• (seismology) A number of small earthquakes (or other seismic events) occurring, with no clear cause, in a specific area within a relatively short space of time.
  "Earthquakes were another concern, particularly after swarms were felt in Oklahoma."

verb

• (intransitive) To move as a swarm.
  "There is an hour or two, after the passengers have embarked, which is disquieting and fussy. Mail bags, so I understand, are being put on board. Stewards, carrying cabin trunks, swarm in the corridors."
• (intransitive) To teem, or be overrun with insects, people, etc.
  "Every place swarming with soldiers."
• (transitive) To fill a place as a swarm.
  "All is well until Treorchy, where the platform is swamped by teenagers who have been attending an event. Around four dozen unescorted 12 to 16 year-olds swarm aboard and begin to run riot through the train. Their behaviour is appalling and the presence of CCTV no deterrent."
• (transitive) To overwhelm as by an opposing army.
  "So, yeah. The overall conclusion of the big gunfight being that, if Yamato is able to tackle the Colorados early, then the Japanese probably have a, maybe a sixty-to-sixty-five-percent chance of pulling this off... although you say "pulling it off", it's more a case of "the Japanese are the last battleship standing"; they tend to then just get swarmed by angry Fletchers[…]"