perfect storm

perfect storm

noun
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.
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perfect storm
 
n
a combination of events which are not individually dangerous, but occurring together produce a disastrous outcome

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  perfect storm
Part of Speech:  n
Definition:  a weather pattern involving the collision of a northeaster, a large high pressure system, and unusually cold Canadian air pushing down plus moisture and warm air pushing up from a hurricane to the south to create a 'once-in-a-lifetime' storm
Example:  A perfect storm is a weather phenomenon that develops maybe two or three times every century.
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