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blow sky-high

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blow something sky-high

to make something that someone is trying to achieve fail completely, often by telling people something which should have been a secret He blew the whole deal sky-high by telling the newspapers about it.

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