flash mob - definition and synonyms

verb [intransitive] 

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  1. to suddenly gather in a public place, do something for a short time, and quickly go away again
    1. a.
      [transitive] [often passive] to surprise someone by going in a large group to the place where they are, doing something for a short time, and quickly going away again

derived words

flash mobbing

 

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noun [uncountable]

flash mobber

 

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noun [countable]