IdiomDaily LifeEnglish

do something by the seat of one's pants

Meaning: To accomplish something by luck and instinct rather than skill.

Example: “We had no rehearsal, so we did the whole show by the seat of our pants.”

Origin: Early aviation slang, from a genuine cockpit skill: pilots flying planes with few or unreliable instruments learned to sense a plane's climbing, turning, or stalling through physical feedback alone — vibration, pressure, the way forces pushed against the body, felt most directly through the seat of the pants against the seat of the plane. The phrase reached wide public use in coverage of Douglas Corrigan's unauthorized 1938 transatlantic flight, though an earlier British version, "fly by the seat of his trousers," suggests the expression started life on the other side of the Atlantic before an American newspaper picked it up that same year with the now-familiar wording. It broadened from literal blind flying to any situation improvised on instinct and feel, with no plan or reliable data to fall back on.

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