判はん断だんミス

noun

error of judgment; miscalculation; bad decision

Refers to a mistake in assessing a situation or making a choice, often with a nuance of personal responsibility. Common in business, sports, and everyday contexts.

• あの時とき、判はん断だんミスをしなければ、試し合あいに勝かてたかもしれない。

  If I hadn't made an error of judgment at that moment, we might have won the game.