It was my fault.

Meaning

Taking responsibility for a mistake.

Examples

• John: The report is late.
• Alice: I'm so sorry. I didn't finish it on time.
• John: It's okay, these things happen, but next time try to focus on timely completion.
• Alice: Yes, you are right. <b>It was my fault</b>. I should have prioritized it better. <b>It was my fault</b> for not planning well.