I'm not entirely sure I understand...

Meaning

Seeking clarification politely.

Examples

• John: The new regulations are quite complex.
• Alice: <b>I'm not entirely sure I understand</b> the implications of section 3.
• John: Let me explain it again. It's about...
• Alice: Thank you. Even after your explanation, <b>I'm not entirely sure I understand</b> the long-term effects.