Definition of fly or drive by the seat of one's pants in English:

fly (or drive) by the seat of one's pants

informal Rely on instinct rather than logic or knowledge.
More example sentences
  • After finding fame and success you can't just fly by the seat of your pants (when it comes to creativity).
  • Be prepared and don't fly by the seat of your pants.
  • Well, ‘something came up’ and they didn't show up, so I was stuck with teaching it, trying to fly by the seat of my pants.
See parent entry: pants

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Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope