一いっ失しつ

noun

a loss; a failure; a mistake

A single mistake or failure, often used in the context of learning from errors or in contrast with success. Common in set phrases like 一失を顧みる.

• 彼かれは一いっ失しつを反はん省せいして、次つぎの試し合あいに備そなえた。

  He reflected on his one mistake and prepared for the next match.

• 一いっ失しつを笑わらって済すませるわけにはいかない。

  We can't just laugh off a single failure.