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Destroy by explosion, explode, as in
Once the charge is set, get away fast or you'll be blown sky-high
Also see: under
Refute completely, as in
The lab report has blown your theory sky-high
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Nearby words for blow sky-high
blow one's stack
blow one's top
blow someone away
blow someone off
blow someone out
blow someone out of the water