Definition of flashmob noun from the Oxford Advanced American Dictionary

 

flashmob

 noun
noun
NAmE//ˈflæʃmɑb//
 
 
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a large group of people who arrange (by cell phone or e-mail) 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 time
flashmobber
 
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noun
flashmobbing
 
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noun [uncountable]