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grey swan

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noun [countable] British grey swan pronunciation in British English /ˌɡreɪ ˈswɒn/
  1. an event which is possible and known about, and potentially extremely significant, but considered to be unlikely to happen

    Britain's leading ad man has warned that a number of "grey swans" in the global economy are causing clients to cut spending.


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breakfast rave

a rave … that takes place early in the morning and where there is no alcohol or drugs …

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