blow sky-high

blow (something) sky-high

1. Literally, to destroy something through an explosion. The tanks blew the enemy fortress sky-high.
2. To undermine or negate something completely. 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 he blew that idea sky-high when he came in late to work each day this week.
See also: blow

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

blow somebody/something ˌsky-ˈhigh

(informal) destroy somebody/something completely in an explosion: The explosives factory was blown sky-high when one of the workers lit a match.
See also: blow, somebody, something
References in periodicals archive ?
Water officials say that under the strain of an earthquake or a massive power outage, the water mains could blow sky-high, possibly killing anyone above them.
The phthalate issue is going to blow sky-high and the Mirror has done a good job in highlighting it.