make it up as one goes along

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make it up as one goes along (third-person singular simple present makes it up as one goes along, present participle making it up as one goes along, simple past made it up as one went along, past participle made it up as one has gone along)

1. (idiomatic) To improvise continuously.

   This game makes no sense! It's as if you're making it up as you go along!

• fly by the seat of one's pants

• think on one's feet