fly in the teeth of (something)(redirected from fly in the teeth of)
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fly in the teeth of (something)
To be or act in clear conflict with or opposition to something else. I can't believe you said something so awful. It flies in the teeth of everything we stand for! They want to change the entire direction of the project, completely flying in the teeth of all the hard work we've done so far. Her controversial new theory flies in the face of everything we know about quantum mechanics.