Japanese phrase
私の確認不足です。 watashi no kaku nin fu soku de su
Meaning
I failed to check it properly.
When to use it
Shows a failure to check something carefully enough. It is a polite way to apologize and accept responsibility, especially at work.
Example dialogue
納期を間違えました。 nō ki o ma chiga e ma shi ta
I got the deadline wrong.
すみません、私の確認不足です。 su mi ma se n watashi no kaku nin fu soku de su
Sorry, I failed to check it properly.