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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 leave Groups of people
(Definition of flashmob noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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