A swarm is a good word for a large group of bees going on the attack — not good news. Like bees, any group of people or animals can be considered a swarm if they act together and quickly — even fiercely.

On a hot day, when an ice-cream truck shows up, it's usually greeted by a swarm of hot, hungry kids. People at a concert can be a swarm — and people in the swarm can be hurt, because there's lots of pushing and shoving. When tickets for a popular movie go on sale, a swarm of people will swarm the theater. As you can see, swarm works as either a noun or verb, and people could teach bees a thing or two about swarming.

Definitions of swarm
  1. noun
    a group of many things in the air or on the ground
    “a swarm of insects obscured the light”
    synonyms: cloud
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    infestation, plague
    a swarm of insects that attack plants
    type of:
    group, grouping
    any number of entities (members) considered as a unit
  2. noun
    a moving crowd
    synonyms: drove, horde
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    type of:
    a large number of things or people considered together
  3. verb
    move in large numbers
    synonyms: pour, pullulate, stream, teem
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    pour out, spill out, spill over
    be disgorged
    type of:
    crowd, crowd together
    to gather together in large numbers
  4. verb
    be teeming, be abuzz
    “The garden was swarming with bees”
    synonyms: pullulate, teem
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    be full of
    type of:
    buzz, hum, seethe
    be noisy with activity
Word Family

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