Refers to an error or oversight, often implying a failure to pay proper attention. Used in formal or written contexts.
彼の失着が原因でプロジェクトが遅れた。
The project was delayed due to his mistake.
この報告書には重大な失着がある。
There is a serious oversight in this report.
Compound of 失 (loss, error) and 着 (arrive, wear). The exact derivation is uncertain; the spelling is conventionally associated with the meaning of a mistake or oversight.