I sincerely apologize for the oversight.

Meaning

A formal apology for a mistake.

Examples

• John: 'I'm so sorry, Alice. I completely forgot about our meeting.'
• Alice: '<b>I sincerely apologize for the oversight</b>. I'll make sure it doesn't happen again.'
• John: '<b>I sincerely apologize for the oversight</b>; it won't happen again.'
• Alice: 'The report was submitted late, John.'