blow sky-high, to

blow sky-high

1. To be completely destroyed by a massive explosion. The soldiers detonated the explosives and watched the vehicle blow sky-high. Someone left the gas on, and the whole building ended up blowing sky-high.
2. To destroy someone or something through an explosion. In this usage, a noun or pronoun is used between "blow" and "sky-high." The tanks blew the enemy fortress sky-high. Once we set off the bomb, we'll blow those snitches sky-high!
3. To undermine or negate something completely. In this usage, a noun or pronoun is used between "blow" and "sky-high." I thought I had finally discovered the problem with our experiment, but, when we tested it, the results blew my theory sky-high. Bob was considered for the promotion, but that idea was blown sky-high when he came in late to work each day this week.
See also: blow
Farlex Dictionary of Idioms.

blow 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
The American Heritage® Dictionary of Idioms by Christine Ammer.

blow sky-high, to

To refute completely, to explode a thesis or idea. While this expression has a modern sound, it is not so very new. Andrew Jackson, in a letter of 1845, wrote, “Put your veto on them both, or you and your Secretary will be blown sky-high.”
See also: blow
The Dictionary of Clichés by Christine Ammer
See also:
  • blow sky-high
  • blow somebody/something sky-high
  • blow something sky-high
  • go sky-high
  • measure up
  • measure up (to someone or something)
  • (as) high as the sky
  • out of a clear blue sky
  • out of a clear sky
  • out of a/the clear (blue) sky