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Definition grey swan in British English

grey swan noun

[countable] noun
/ˌɡreɪ ˈswɒn/
1

an event which is possible and known about, and potentially extremely significant, but considered to be unlikely to happen

Example

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

Synonyms and related words
Definition grey swan in British English