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Definition of flash mob noun from the Oxford Advanced Learner's Dictionary

flash mob

noun
 
/ˈflæʃ mɒb/
 
/ˈflæʃ mɑːb/
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  1. a large group of people who arrange (by mobile phone or email) to gather together in a public place at exactly the same time, spend a short time doing something there and then quickly all leave at the same timeTopics Phones, email and the internetc2
previously
adverb
 
 
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