blow somebody/something sky-high
1. Destroy by explosion, explode, as in Once the charge is set, get away fast or you'll be blown sky-high. [Early 1800s] Also see under blow up.
2. Refute completely, as in The lab report has blown your theory sky-high. [Mid-1800s]
See also: blow
blow something sky-high
If someone or something blows someone's plan or intention sky-high, they cause it to fail completely. If Diana breathes a word of this to Mills, it could blow the whole scheme sky-high.