An oversight, omission, or mistake—something missed because of carelessness or inattention.
書類のチェックに抜け目があって、提出期限に間に合わなかった。
There was an oversight in checking the documents, and they didn't meet the submission deadline.
見積もりに抜け目がないように、細かく確認した。
I checked carefully to make sure there were no omissions in the estimate.
彼の計画には抜け目があったため、問題が起きた。
Because there was an omission in his plan, problems occurred.