flashmob
noun [ C ] uk/ˈflæʃ.mɒb/ us/ˈflæʃ.mɑːb/
快闪族（一群人约定快速聚集到某地做某一有趣或可笑之事后再全部闪离）
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
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