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1.
An accident that's extremely unlikely and unusual.
Fabio was involved in a freak accident. He got hit in the face by a duck while riding a roller coaster.
by assortedwarheads February 13, 2011
 
2.
Something that happens that is so incomprehensible that only a freak could have it happen to them.
A freak accident happened when Tori was born...
by Ridgeback September 04, 2006