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English definition of “flashmob”

flashmob

noun [C]     /ˈflæʃ.mɒb/ US  /-mɑːb/
a group of people who arrange, by email or mobile phone, to come together in a place at the same time, do something funny or silly, and then leaveGroups of people
(Definition of flashmob noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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