fly in the face of
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fly in the face 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 face of everything we stand for! They want to change the entire direction of the project, completely flying in the face 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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fly in the face of someone or somethingand 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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
fly in the face ofbe openly at variance with what is usual or expected.
Farlex Partner Idioms Dictionary © Farlex 2017
fly in the face of, to
To challenge, to take on despite overwhelming odds. This expression, which often adds something that one flies in the face of—danger, Providence, or the like—may well come from the barnyard, alluding to an angry hen flying in the face of another, larger animal, or to falconry, where an irritated hawk might fly into its master’s face. It appeared in print in the sixteenth century and was well on its way to being a cliché by the time Henry Fielding wrote, “This was flying in Mr. Alworthy’s face” (Tom Jones, 1749).
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer