fly in the face of sth

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 ˈsth

(written) oppose or be the opposite of something that is usual or expected: Such a proposal is flying in the face of common sense.
See also: face, fly, of, sth