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- fly by the seat of (one's) pants
fly by the seat of (one's) pants
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.