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English definition of “flashmob”

flashmob

noun [C] uk   /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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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