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blow sth/sb out of the water

Definition

to destroy or defeat something or someone completely: They came to court with fresh evidence that would, they said, blow the prosecution's case completely out of the water.Winning and defeatingScoring, winning and losing in sportDestroying and demolishingDamaging and spoiling
(Definition of blow sth/sb out of the water from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)