I beg to differ.

Meaning

I respectfully disagree.

Examples

• John: 'I believe this project is on track to be completed on time.'<br>
• Alice: '<b>I beg to differ</b>; the recent delays suggest otherwise.'
• John: '<b>I beg to differ</b>; I foresee several potential drawbacks.'
• Alice: 'The new policy is beneficial for the company.'<br>