fly in the face of

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fly in the face of

To be or act in clear opposition to something else. I can't believe you said something so awful. It flies in the face of everything we stand for! Don't quit now, that just flies in the face of all your hard work.
See also: face, fly, of

fly in the face of someone or something

 and fly in the teeth of someone or something
Fig. to challenge someone or something; to go against someone or something. This idea flies in the face of everything we know about matter and energy. You had better not fly in the face of the committee.
See also: face, fly, of

fly in the face of

Also, fly in the teeth of. Act in direct opposition to or defiance of. For example, This decision flies in the face of all precedent, or They went out without permission, flying in the teeth of house rules. This metaphoric expression alludes to a physical attack. [Mid-1500s]
See also: face, fly, of

fly in the face of

be openly at variance with what is usual or expected.
See also: face, fly, of