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

 

flash mob

 noun
noun
BrE BrE//ˈflæʃ mɒb//
 
; NAmE NAmE//ˈflæʃ mɑːb//
 
Social networking, Mobile devices
 
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a large group of people who arrange (by mobile/cell 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 time See related entries: Social networking, Mobile devices