If you're flying by the seat of your pants, it means you don't know what you're doing, or you have no way of knowing if you're on the right track; essentially, you're “flying blind".
Origin:
This term comes from aviation. When people first began flying aircraft, they did not have the same advanced navigation tools and abilities to communicate with people on the ground.
Therefore, people were flying by the seat of their pants or flying without the ability to communicate or fully plan things out.
Idiomatic expressions are a type of informal language that have a meaning different from the meaning of the words in the expression.
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