Flash-mob definition

A large impromptu public gathering of people, especially when organized through text messaging or online social networks.
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An often impromptu and unannounced gathering of people in a public place, organized by means of social media.
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A group of people who converge on a spot with little forewarning, perform some action (usually a protest or a dance), and disperse quickly.
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Alternative Forms

Alternative Form of flash-mob - flash crowd, flashmob

Other Word Forms

Noun

Singular:
flash-mob
Plural:
flash-mobs

Origin of flash-mob

  • The term "flash crowd" was coined by Larry Niven in Flash Crowd, a story about cheap teleportation in the future.

    From Wiktionary