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perfect storm

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noun
  1. a detrimental or calamitous situation or event arising from the powerful combined effect of a unique set of circumstances: a perfect storm battering corporate pension plans.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for perfect storm

perfect storm

noun
  1. a combination of events which are not individually dangerous, but occurring together produce a disastrous outcome
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012