by the seat of your pants
 by the seat of your pants — see seat, 1
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 Main Entry: pants
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 by the seat of your pants
  : by using your own judgment and feelings to deal with each new problem or task without planning, preparation, or help from others
   He was running the company by the seat of his pants.
   We were flying by the seat of our pants when we started our business.
   — see also seat-of-the-pants
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 Main Entry: seat