Meaning of “fly in the face of sth” in the English Dictionary

british dictionary

"fly in the face of sth" in British English

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fly in the face of sth

C2 to completely oppose what seems sensible or normal:

This is an argument that seems to fly in the face of common sense.

(Definition of “fly in the face of sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)