fly beneath (the/someone's) radar
To go without being noticed, detected, or addressed. A: "Have you heard this band's latest album?" B: "I didn't even know it was out, it must have flown beneath my radar." Every year, the government promises to do something about the homelessness problem, yet every year it seems to fly beneath the radar.
fly under (the/someone's) radar
To go without being noticed, detected, or addressed. A: "Have you heard this band's latest album?" B: "I didn't even know it was out, it must have flown under my radar." Every year, the government promises to do something about the homelessness problem, yet every year it seems to fly under the radar again.
fly by the seat of (one's) pants
To rely on one's instinct, as opposed to acting according to a set plan. I really don't know how to operate this thing, I'm just flying by the seat of my pants here. You can't just fly by the seat of your pants, Jenna—please give your future some serious thought.
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.
fly in the teeth of
To be or act in clear opposition to something else. I can't believe you said something so awful. It flies in the teeth of everything we stand for! Don't quit now, that just flies in the teeth of all your hard work.